• Light and Health Are Not Pseudoscience: What Two Nobel Prizes Tell Us About the Next Step in Lighting Research

    By Lawrence Lin
    GLGA 主席|GLG 董事會成員|IWBI WELL Light Concept Advisor|LRS 創辦人兼 CEO

    Today, while attending the Good Light Group (GLG) board meeting, I asked the directors—particularly our Chief Scientist, Marijke—about the significance of the newly announced Nobel Prize in Physiology or Medicine for photobiology research.

    In our discussion, everyone agreed that this is an inspiring discovery for understanding the mechanisms connecting light and physiology.

    For those of us who have worked in lighting for many years, the news deserves particular attention. Light does more than allow us to see objects; it can also participate in the transmission of biological signals. Science is increasingly providing answers to fundamental questions: Where does light act? Through what mechanisms? And what effects does it produce?

    However, the more exciting a discovery is, the more important it is to describe it accurately.

    This Nobel Prize was not awarded for a particular “healthy light,” nor does it demonstrate that everyday lighting can alter human genes. It recognizes the discovery of light-gated ion channels and optogenetics—a method that allows researchers to use light to precisely intervene in the activity of specific cells.[1]


    1 | From 2017 to 2026: Two Different Scientific Paths

    In 2017, Jeffrey C. Hall, Michael Rosbash, and Michael W. Young were awarded the Nobel Prize in Physiology or Medicine for their discoveries concerning the molecular mechanisms controlling circadian rhythms.

    Their research revealed that the biological clock is not merely an abstract metaphor. Gene expression, protein accumulation, and feedback regulation within cells can form a continuously operating rhythmic mechanism that enables organisms to anticipate daily changes. These mechanisms are associated with physiological processes including sleep, hormone secretion, body temperature, and metabolism.

    It is important to clarify that the 2017 prize recognized the molecular mechanisms of the biological clock. It was not awarded for the health effects of a particular lighting product, nor was it the first discovery that light affects the human body.

    How light enters the circadian regulation system is part of another line of research. A key study published in 2002 identified intrinsically photosensitive retinal ganglion cells and their connection to circadian regulation. This provided an important foundation for subsequent understanding of melanopsin, ipRGCs, and the non-visual effects of light.

    In 2026, Karl Deisseroth, Peter Hegemann, and Georg Nagel were recognized for showing another possibility: using light-sensitive proteins to turn specific cells into targets that can receive optical commands.[1]

    The two Nobel Prizes are not successive confirmations of the same mechanism.

    One revealed how life keeps time; the other developed a tool for controlling cellular activity with light. For light research, together they broaden our understanding of how light can interact with living systems.


    2 | Optogenetics: Turning Light into a Cellular Control Signal

    The key to this research came from light-sensitive proteins found in microorganisms.

    Take channelrhodopsin-2 (ChR2) from green algae as an example. It can both sense light and function as an ion channel in the cell membrane. Research published in 2003 demonstrated that when ChR2 is expressed in animal cells, light can directly open the channel, allowing cations to flow across the membrane.

    Researchers subsequently introduced genes encoding these proteins into neurons. Cells that originally lacked this light-sensing capability thereby acquired an optical control interface.

    Light-sensitive protein absorbs a photon → protein changes conformation → channel opens → ions flow → membrane potential changes → the neuron may fire.

    The actual photon absorber is the retinal chromophore within the protein. After absorbing light, it undergoes isomerization, driving the protein into a different photochemical state and changing the conductance of the channel.

    Under typical resting conditions in a neuron, opening ChR2 produces a net inward cation current, depolarizing the cell. Once a sufficient threshold is reached, the neuron’s own voltage-gated channels generate an action potential.

    Light is the triggering signal here. Neural firing still depends on the cell’s existing ion gradients, electrophysiological state, and channel systems.

    In 2005, a landmark study by Boyden, Deisseroth, Nagel, and colleagues demonstrated the ability to control neuronal firing on a millisecond timescale using brief pulses of light.[2] Researchers subsequently developed light-driven inhibitory tools, meaning that light could be used not only to activate neural activity but also to suppress it.

    © The Nobel Committee for Physiology or Medicine. Ill. Mattias Karlén


    3 | Why Is This a Major Breakthrough in Research Methodology?

    Observing that certain neurons become active during a particular behavior does not mean that we know those neurons cause the behavior.

    They could be the cause, the consequence, or simply be involved in another process occurring at the same time.

    Optogenetics enables researchers to intervene directly: activate a particular class of cells and observe whether a response occurs; inhibit them and see whether the response is reduced; change the timing of stimulation and examine how the outcome changes.

    This gives neuroscience a much stronger ability to test causality rather than stopping at observations of correlation.

    Of course, a single intervention cannot automatically explain all the causes of a complex behavior. The accuracy of cell targeting, possible unintended effects of optical stimulation, and the adequacy of experimental controls all remain critical to the reliability of the conclusions.

    For us, this methodology is particularly worth learning from: research into light and health requires clearly defined intervention conditions, as well as experimental designs capable of ruling out alternative explanations.


    4 | It Is Not a “Magic Wavelength” That Makes the Difference

    Early ChR2 studies commonly used blue light around 470 nm. The 2005 experiment used a 450–490 nm range and compared short stimulation pulses of 5, 10, and 15 milliseconds.[2]

    Different light-sensitive tools developed later can operate at different wavelengths. For example, the light-driven chloride pump NpHR uses yellow light to inhibit neural activity, while ChrimsonR, used in some visual-restoration research, is stimulated with orange light around 595 nm.

    This does not mean that blue light is inherently associated with “excitation,” or that orange light is inherently associated with “vision restoration.”

    The effect depends on which protein is expressed by the target cell and whether the light can effectively reach the target.

    Likewise, dose cannot be adequately described using a single total-energy value. At a minimum, we need to specify:

    1. Wavelength and spectral distribution;
    2. Irradiance or photon flux at the target cells;
    3. Pulse duration, intervals, and stimulation sequence;
    4. Expression level, activation/deactivation kinetics, and recovery state of the photosensitive protein;
    5. Absorption and scattering of light within the tissue.

    The photocurrent generated by ChR2 exhibits a peak, followed by decay and recovery. Continuous illumination and short pulses can produce different firing patterns even when the total exposure is the same. Subsequent models of the photocycle were developed precisely to describe these dynamic changes.

    Therefore, wavelength is only the starting point. Where the light reaches the tissue, and the temporal pattern in which it arrives, can be equally important.


    5 | From Research Tool to Medical Application

    Optogenetics has now entered human research.

    In 2021, Nature Medicine reported partial recovery of visual function in a blind patient. Researchers delivered a vector encoding ChrimsonR into the eye and used specialized goggles to convert visual information into light pulses projected onto the retina.

    After treatment, and while wearing the goggles, the patient was able to perform certain tasks involving object perception, localization, counting, and reaching. Without the goggles, the patient did not demonstrate the same ability to detect objects.[3]

    This was an important clinical exploration, but its implications have clear boundaries: it did not restore normal vision, and it was not an effect produced by ordinary lighting.

    The promise came from a specific biological target, gene delivery, an optical system, and functional validation. None of these components can simply be omitted.


    6 | The Lighting Industry: Moving from “What Light Is There?” to “What Light Does a Person Actually Receive?”

    Everyday lighting and optogenetics operate through different mechanisms. However, the precise description of stimulation conditions in optogenetics provides valuable inspiration for lighting research.

    We are accustomed to describing light from the product side: power, luminous flux, correlated color temperature, color rendering, and spectrum.

    When the question concerns physiological responses in people, we also need to know: after light passes through a space, reflection, obstruction, and patterns of use, how much actually reaches the eye, when does it arrive, and for how long?

    This is the shift from source specifications to actual human exposure.

    CIE S 026 establishes a measurement framework for describing the stimulation of five classes of photoreceptors in the human eye. Mel-EDI is one of the metrics used to describe melanopsin-related stimulation, but it is not a direct measure of sleep quality, cognitive performance, or overall health outcomes.

    A field measurement can tell us whether a particular stimulation condition has been achieved. Determining the resulting human outcome requires the corresponding research evidence.

    Likewise, photobiomodulation research involving red or near-infrared light should not borrow the mechanism of optogenetics as evidence of efficacy. Different pathways require their own exposure models, dose-response relationships, and evidence of effects.


    6 | What Should Future Light Research Prioritize?

    From the LRS perspective, we believe three areas deserve continued attention.

    01. Make Research Conditions Reproducible

    Without clear information about the spectrum, measurement location, timing protocol, and equipment, research findings are difficult to compare and even more difficult to translate into reproducible applications.

    CIE TN 016:2026 proposes the ENLIGHT checklist for reporting optical characteristics in laboratory-based human light-intervention studies, with the aim of improving research reproducibility and comparability. It is not a standard specifically for optogenetics, but it reflects the same fundamental requirement: the light stimulus must be described clearly and completely.

    02. Include the Space and the User in Design and Validation

    The same luminaire can produce different ocular exposure depending on the space, viewing direction, and time of use. Research and design should not stop at the light source. They should also establish the connection between spatial models, actual measurements, and records of real-world operation.

    03. Match Every Efficacy Claim to Its Evidence

    “More comfortable,” “supports circadian regulation,” “improves sleep,” and “enhances learning performance” are not interchangeable claims. Each outcome requires an appropriate study population, measurement method, and control condition.

    Mechanistic discoveries can help us formulate better hypotheses; product efficacy still has to be answered by evidence concerning the product and the context in which it is used.


    8 | LRS: Build Light for Life

    Today’s board discussion left me feeling both inspired and responsible.

    Inspired because light research is continually expanding our understanding of life.

    Responsible because the industry must understand these discoveries accurately—neither overlooking them nor turning them into claims that go beyond the evidence.

    光配方研究院(Lighting Recipe Studio, LRS) focuses on research into healthy lighting environments, sensing technology, testing and monitoring equipment, algorithm capabilities, and spatial application systems. We care not only about lighting outcomes, but also about the true relationships between light, people, space, time, and activities. Our aim is to explain important research clearly, distinguish between different mechanisms, and strengthen the connection between design, measurement, and real-world validation.

    What the Nobel Prize gives us is not a health label that can simply be attached to a luminaire.

    It shows us that patiently pursuing a fundamental question can ultimately lead to discoveries that transform the way research is conducted.

    The relationship between light and health involves mechanisms that can be studied and outcomes that can be tested. The value created by the lighting industry in its next stage will depend on whether we can turn this knowledge into designs and applications that stand up to rigorous validation.

    Light and health are not pseudoscience.
    Ensuring that every health claim can be traced back to evidence is work we all share
    — LRS


    Further Reading and Original Sources

    [1] Official 2026 Nobel Prize in Physiology or Medicine Announcement
    Award topic: The discovery of light-gated ion channels and optogenetics.

    https://www.nobelprize.org/prizes/medicine/2026/press-release

    [2] Landmark 2005 Optogenetics Paper
    Boyden ES, Zhang F, Bamberg E, Nagel G, Deisseroth K.
    Millisecond-timescale, genetically targeted optical control of neural activity.
    Nature Neuroscience, 8, 1263–1268 (2005).

    The study demonstrated the use of ChR2 expression to control neuronal activity on a millisecond timescale using pulses of light.

    https://doi.org/10.1038/nn1525

    [3] 2021 Study on Partial Recovery of Visual Function in Humans
    Sahel JA et al.
    Partial recovery of visual function in a blind patient after optogenetic therapy.
    Nature Medicine, 27, 1223–1229 (2021).

    The study combined gene delivery with specialized light-stimulation goggles and reported partial recovery of visual function in a blind patient. The effect was not produced by ordinary lighting.

    Note: The board discussion was compiled from the author’s meeting notes. The scientific interpretation and industry recommendations in this article were written by the author and do not constitute direct quotations from individual scientists or an official position statement of GLG. The cover image is a conceptual visual creation and does not represent an experimental apparatus or clinical treatment setting.


  • 把光說清楚 18|健康照明/綜合照明基礎十八講

    驗收不是測一次 lux:如何完成設計—調試—驗證閉環

    把「設計意圖」變成可以複測、可以運作的長期證據

    作者|林紀良 Lawrence Lin

    GLGA 主席|GLG 董事會成員|IWBI WELL Light Concept Advisor|LRS 創辦人兼 CEO

    工程竣工那天,所有燈打開,桌面照度測完,驗收表簽名。三個月後,時間表被物業改過,窗簾長期關閉,幾個感測器離線,夜間場景再也沒有被調用。紙面上的健康照明,悄悄變成了普通照明。

    綜合照明的驗收,不是某個時刻的一張照片,而是一段運作邏輯的驗證。設計、安裝、調試、測量、使用者回饋與持續複核,缺一環都可能讓目標失效。


    驗收前:先鎖定基線

    最終圖紙應包含燈具、驅動、控制地址、場景表、測點和目標值。設備替換必須重新核對光譜、配光與調光性能。現場測量儀器要有校正訊息,測量人員使用統一方向、時間和記錄格式。

    日光參與的空間,應預先定義天氣或窗簾條件。無法控制天氣時,可以分別記錄日光與電光狀態,而不是直接將不同日期的讀數比較。


    調試中:逐場景檢查系統

    不僅測額定全開,也要檢查日間、傍晚、睡前、夜間安全和清潔維護等場景。

    眼睛位置 mel-EDI、眩光觀察點、顏色、最低穩定調光和時間光調製;同時測試感測器、手動覆蓋、斷電恢復和遮陽連動。

    發現偏差時,要能追溯是燈具、驅動、安裝角度、表面反射、日光或控制邏輯造成。只把系統整體“調亮一點”,常常會掩蓋真正問題。


    交付後:驗證真實使用

    交付文件應讓物業看得懂:場景為何存在、哪些參數不能隨意改、設備更換後要複測什麼。

    運行一段時間後,可抽查關鍵眼位和場景,查看控制日誌,並訪談使用者是否遇到眩光、過暗、頻繁跳變或操作困難。

    人的主觀回饋不能取代計量,計量也不能取代人的體驗。兩者放在一起,才是完整的營運證據。


    一份最小閉環清單

    需求階段定義人、時間與活動;設計階段計算視覺與 α-opic 指標;採購階段鎖定資料與介面;樣板階段驗證極端狀態;施工階段記錄變更;調試階段逐場景測試;營運階段訓練、回訪與復測。

    這條鏈的意義,不是增加表格,而是讓每個健康相關的宣稱都有出處、條件和負責人。


    目前可以說/還不能說

    目前可以說: 透過可追溯的測點、場景、設備資料和運行複核,可以證明系統在指定條件下達到設計目標。

    還不能說: 一次竣工測量可以證明長期健康效果,或今後任何運作狀態都持續合格。


    今天就能做的三件事

    • 把驗收表從「燈具清單」升級為「場景+測點+條件+結果+責任人」。
    • 將控制邏輯、校準資訊和關鍵參數寫入運作手冊。
    • 在交付後 3 至 6 個月安排一次複測與使用者回訪。

    證據標籤:工程實務/開放式問題。
    現場閉環能驗證性能實現;長期健康結果仍需適當研究設計。


    參考資料

    • CIE PS 001:2024:https://cie.co.at/publications/cie-position-statement-integrative-lighting-recommending-proper-light-proper-time-3rd
    • CIE S 026:2018:https://www.cie.co.at/publications/cie-system-metrology-optical-radiation-iprgc-influenced-responses-light-0
    • CIE TN 016:2026:https://www.cie.co.at/publications/comprehensive-checklist-reporting-light-characteristics-laboratory-based-human-studies
    • ISO/CIE 8995-1:2025:https://www.iso.org/standard/76342.html
  • 把光說清楚 17|健康照明/綜合照明基礎十八講

    從光配方到可計算、可採購的系統規格

    目標只有被寫進條件、介面與容差,才有機會在現場實現

    作者|林紀良 Lawrence Lin

    GLGA 主席|GLG 董事會成員|IWBI WELL Light Concept Advisor|LRS 創辦人兼 CEO

    不少方案寫著「早晨活力光、午間專注光、夜間舒緩光」。詞很漂亮,招標時卻不知道該買什麼;燈具進場後,各廠家用不同協議,調試人員只能憑感覺調色。

    光配方不是幾個場景名字,而是一組與人、地點、時段和活動綁定的效能目標。它必須經過計算、樣板、採購資料和控制接口,才能從概念走到工程。


    一張合格的場景規格要寫什麼

    先寫適用人群與活動,再寫運行時段和持續時間;隨後定義工作面照度、眼睛位置 mel-EDI、眩光、顏色品質、調光範圍和時間光調製要求;最後寫清測點、方向、容差、日光條件與人工覆蓋方式。

    例如「日間辦公場景」不能只寫 250 lx mel-EDI。也應說明坐姿眼位、主要朝向、目標覆蓋比例、工作面視覺要求、窗簾狀態和維持時段。夜間場景則要同時保留通行與任務安全。


    採購的不是一顆數字

    供應商應提供不同 CCT 與調光狀態的光譜資料、配光檔案、色彩品質、效率、時間光調變和控制相容性。若只提供額定功率下的單點偵測,設計團隊無法預測真實場景。

    系統規格也應明確驅動器最低穩定輸出、調光曲線、位址與分組、感測器、遮陽連動、資料記錄和維護替換原則。否則同型號更換驅動器後,整個配方可能會改變。


    儀器在這裡扮演什麼角色

    方法先於儀器。 先定義要回答的問題,再選擇照度計、光譜輻射計、亮度測量與時間光調變設備。

    以 In.Licht 一類綜合測量工具為例,它的價值不是替設計做決定,而是在相同測點和場景下記錄光譜、照度及 α-opic 量,幫助團隊比對設計與現場。

    沒有明確測量協議,再好的儀器也只會產生更多孤立數字。


    目前可以說/還不能說

    目前可以說: 可執行的光配方應包含目標、條件、設備資料、控制邏輯、容差和驗證方法。

    還不能說: 購買某類可調燈具或測量儀器,就等於完成綜合照明系統。


    今天就能做的三件事

    • 把每個場景改寫成「人+活動+時段+目標+測點+控制」。
    • 招標前統一光譜、配光、調光與控制資料格式。
    • 用一比一樣板驗證最亮、典型與最低調狀態。

    證據標籤:工程實務。 性能化規格與可追溯數據能提高實現率;具體容差應由項目設定。


    參考資料

    • CIE S 026:2018:https://www.cie.co.at/publications/cie-system-metrology-optical-radiation-iprgc-influenced-responses-light-0
    • ANSI/IES RP-46-25:https://store.ies.org/product/recommended-practice-supporting-the-physiological-and-behavioral-effects-of-lighting-in-interior-daytime-environments/
    • CIE TN 012:2021:https://cie.co.at/publications/guidance-measurement-temporal-light-modulation-light-sources-and-lighting-systems

    下一篇,也是本系列最後一篇:驗收為什麼不能只測一次 lux,以及怎樣讓設計、調試與驗證真正閉環。

  • 把光說清楚 16|健康照明/綜合照明基礎十八講

    先定義人,再定義光:五維需求模型

    用「光—人—空間—時間—活動」避免一上來就選燈

    作者|林紀良 Lawrence Lin

    GLGA 主席|GLG 董事會成員|IWBI WELL Light Concept Advisor|LRS 創辦人兼 CEO

    設計會議最常見的開場是:「這裡用 4000 K 還是 3500 K?

    「當團隊從產品參數開始,往往已經跳過了更重要的問題:誰在這裡、什麼時候來、做什麼、待多久、朝哪裡看?

    我習慣用五個維度整理健康照明需求:光、人、空間、時間、活動。

    五者不是新標準,而是一種避免遺漏的工作方法。先把關係說清,燈具和控制才有依據。


    光:我們能設計和測量什麼

    包括光譜、數量、方向、分佈、持續時間、變化速度、顯色、眩光與時間光調製。

    這裡既有視覺指標,也有 α-opic 指標。每個目標都應應對應測量方法。


    人:誰真正使用空間

    記錄年齡、視覺能力、主要作息、工作班次、特殊敏感度和自主控制需求。

    不要只寫“辦公人員”或“住戶”,那還不夠成為設計輸入。


    空間:光線經過怎樣的建築

    窗戶、朝向、尺度、材料反射、家具和隔間會重塑光線。

    一個好的光譜若被裝入錯誤配光與暗色空間,眼睛仍可能收不到預期暴露。


    時間:目標在什麼時候成立

    至少劃分日間主要活動、傍晚、睡前三小時、睡眠和夜間短時活動。

    不是所有項目都需要不斷動態變化,但必須知道什麼時候該高、什麼時候該低。


    活動:人在此刻要完成什麼

    閱讀、精細操作、交流、放鬆、起夜、護理與螢幕工作,對照度、方向、眩光和控制的要求不同。

    同一房間可能在一天內承擔多個活動,場景便由此產生。


    一個病房的五維翻譯

    白天患者需要明亮、有時間線索的環境,醫生需要檢查與閱讀,訪客需要交流;

    夜間患者需要安靜低刺激,護理人員仍要安全操作。

    設計不能只給房間一個“病房照度”,而要為不同人、時間和活動建立不同但相容的光場景。


    目前可以說/還不能說

    目前可以說: 五維模型能把模糊的「以人為本」轉換成可討論、可計算的輸入,並減少產品先行。

    還不能說: 填完五個欄位就自動得到健康結果;它仍需要標準、專業判斷和現場證據。


    今天就能做的三件事

    • 方案前開一次只談人、時間和活動、不談燈具型號的需求會。
    • 為每個主要場景寫一句「誰在何時做什麼」。
    • 給每個目標補上測點、方向、時段和驗證方法。

    證據標籤:實踐框架。
    它用於組織需求,不冒充科學閾值或認證系統。


    參考資料

    • CIE — Integrative Lighting:https://cie.co.at/eilvterm/17-29-028
    • CIE PS 001:2024:https://cie.co.at/publications/cie-position-statement-integrative-lighting-recommending-proper-light-proper-time-3rd
    • ISO/CIE 8995-1:2025:https://www.iso.org/standard/76342.html

    下一篇,我們把這張需求地圖繼續向前推進:怎樣把「光配方」變成可計算、可採購、可調試的系統規格?

  • 把光說清楚 15|健康照明/綜合照明基礎十八講

    日光、電光與控制,誰才是主角?

    真正的主角不是設備,而是一天當中穩定、適當的光環境

    作者|林紀良 Lawrence Lin

    GLGA 主席|GLG 董事會成員|IWBI WELL Light Concept Advisor|LRS 創辦人兼 CEO

    有些項目把健康照明理解成採購一套可調色溫燈;有些項目則認為只要有大窗,就不必再談電光。兩種看法都低估了建築的現實:日光豐富卻變化,電光穩定卻需要能源,控制決定二者能否在正確時間合作。

    日光通常是白天獲得高水平光暴露的重要資源;電光用來補足、平衡與延伸;控制則根據時間、天氣、遮陽和活動,把兩者組織成可用的系統。


    日光的價值與代價

    日光能提供高照度、豐富光譜和時間線索,也能把人與室外環境連結起來。

    但它會帶來眩光、過熱、反射和不均勻。靠窗位置可能過亮,但空間深處仍不足。

    因此,「多開窗」不是完整策略。建築物朝向、窗牆比、遮陽、玻璃、室內反射與工位方向,需一併考慮。

    良好日光設計往往從建築早期開始,而不是裝修階段補救。


    電光不是日光的仿製品

    電光的優點是可控、穩定、可在需要時補充眼睛方向和任務面上的光。

    它不必機械複製每一分鐘的天空色溫,而應補足日光不足、控制眩光並維持視覺品質。

    在空間深處,可透過明亮牆面、大面積柔和發光或間接照明提高視野亮度;晚間則應能充分調暗,並保留安全、易操作的局部照明。


    控制決定方案能不能活下來

    一個沒有調試的自動系統,可能在陰天頻繁跳變,也可能與遮陽互相打架。控制策略至少要說明感測器位置、時程、調光曲線、最小輸出、人工覆蓋方式與斷電恢復邏輯。

    使用者願意使用,系統才有持續效果。手動控制不是失敗,而是應被設計進去的回饋通道。


    目前可以說/還不能說

    目前可以說: 日光、電光、遮陽與控制應協同,形成隨時間變化但不過度幹擾的光環境。

    還不能說: 有窗就自然滿足所有日間目標,或安裝可調式白燈就自動成為節律照明。


    今天就能做的三件事

    • 建築早期同步模擬日光、眩光與眼睛方向暴露。
    • 為晴天、陰天、清晨、白天和夜間建立少而明確的控制場景。
    • 調試後觀察使用者是否頻繁覆蓋自動控制,並據此修正邏輯。

    證據標籤:已有共識/可謹慎應用。
    綜合利用日光與電光是穩健方向;具體動態策略需要項目驗證。


    參考資料

    • CIE PS 001:2024 :https://cie.co.at/publications/cie-position-statement-integrative-lighting-recommending-proper-light-proper-time-3rd
    • ISO/CIE 8995-1:2025 :https://www.iso.org/standard/76342.html
    • CIE Technical Reports — Daylight and Glare:https://cie.co.at/publications/technical-reports

    下一篇,我們為設計建立一張地圖:先定義人,再從光、人、空間、時間、活動五個維度定義需求。

  • 把光說清楚 14|健康照明/綜合照明基礎十八講

    看不見的閃爍,仍然是照明質量

    從“眼睛看不出來”走向可測量的時間光調製

    作者|林紀良 Lawrence Lin

    GLGA 主席|GLG 董事會成員|IWBI WELL Light Concept Advisor|LRS 創辦人兼 CEO

    樣板間裡,肉眼看不出燈在閃,手機相機卻出現黑色條紋。供應商說「手機不專業,不代表有問題」;用戶又擔心「看不見的頻閃一定會傷腦」。兩種說法都太絕對。

    光輸出隨時間變化,稱為時間光調製。它可能引發可見閃爍、運動中的頻閃效應或快速動眼時的幻影陣列。是否被察覺、是否造成不適,取決於頻率、調製深度、波形、亮度、視野和觀察者。


    手機只能提示,不能定量

    相機滾動快門會放大或製造條紋,因此可用於快速發現線索,卻不能取代合適儀器。

    嚴謹測量要有足夠取樣率、適當的光探頭和明確的測量條件,並分析光輸出隨時間的波形。

    「頻閃百分比」也不是萬能指標。同樣的調製深度,在不同頻率和波形下,視覺影響可以很不一樣。項目需採用與應用相符的評估指標和限值來源。


    調光往往是問題高發區

    不少燈具在額定滿功率時表現良好,調到 10% 或與不同控制器配對後,時間光調變明顯增加。可調白系統也可能在兩路光源混合時出現新的波形。

    所以,檢測不能只做「出廠最優狀態」。

    住宅晚間、教室展示、辦公室節能和飯店低照度場景,都可能運行在低調光區,正是最該測的狀態。


    健康照明不能只看節律

    如果系統為了夜間降低 mel-EDI 而採用不穩定的低水平調光,就可能用一個問題換來另一個問題。

    綜合設計要求光譜、亮度、控制和驅動器共同工作。


    目前可以說/還不能說

    目前可以說: 時間光調製可被測量,並可能產生多種視覺偽影;驅動與調光狀態是關鍵條件。

    還不能說: 手機無條紋就證明“零頻閃”,或所有肉眼不可見的調製都會造成同一種健康傷害。


    今天就能做的三件事

    • 在 100%、典型工作檔和最低常用調光檔分別測量。
    • 把燈具、驅動器和控制器當作完整系統測試。
    • 產品資料寫明測量方法、頻率、波形與運作條件,不只寫「無頻閃」。

    證據標籤:已有共識/開放問題。
    視覺偽影的測量與部分效應已有標準化方法;更廣泛的長期健康影響仍需研究。


    參考資料

    • CIE TN 012:2021:https://cie.co.at/publications/guidance-measurement-temporal-light-modulation-light-sources-and-lighting-systems
    • CIE 249:2022:https://www.cie.co.at/publications/visual-aspects-time-modulated-lighting-systems
    • IES TM-18-18:https://store.ies.org/product/tm-18-18-light-and-human-health-an-overview-of-the-impact-of-optical-radiation-on-visual-circadian-neuroendocrine-and-neurobehavioral-responses/

    下一篇,我們把視野拉回建築:日光、電光與控制,究竟誰才是健康照明的主角?

  • Europe’s Lighting Leaders: Where Will the Next Growth Come From?

    Europe’s Lighting Leaders: Where Will the Next Growth Come From?

    Europe’s Lighting Leaders: Where Will the Next Growth Come From?

    By Lawrence Lin
    Founder, Lighting Recipe Studio · Chair, GLGA
    Former Global CEO, LEDVANCE

    European industry perspective · Information cut-off: 7 September 2026

    Europe’s lighting companies have become fluent in explaining difficult markets. Weak construction, deferred investment, price pressure and the contraction of conventional lamps recur throughout their financial commentary. The responses are familiar too: restructuring, simpler organisations, fewer products, asset disposals and leadership changes.

    These pressures are real. Protecting cash and restoring profitability are essential responsibilities. Yet an uncomfortable question remains: can the industry explain its next source of customer value as clearly as it explains its recent decline?

    Europe has built substantial expertise in optics, industrial design, architectural specification and application engineering. That heritage creates an opportunity, and a reasonable expectation of leadership. Customers should be able to see what these capabilities will deliver next—in their buildings, their working environments and their homes.

    The concern is that a mature market can gradually become an excuse for limited ambition. Energy efficiency and environmental responsibility remain indispensable. They cannot, on their own, explain why a customer should choose one competent supplier over another.

    The next phase of growth will depend on meaningful research, better products and reliable delivery. If established lighting businesses do not turn those capabilities into solutions customers value, the brands that organise lighting within intelligent homes and buildings may increasingly come from elsewhere.

    Author’s disclosure: I previously served as Global CEO of LEDVANCE and as Senior Adviser, Asia Pacific, to Zumtobel Group, with the latter appointment ending on 30 June 2026. This article reflects on an industry whose management decisions I have also helped shape. Company assessments below draw on the sources identified in the references.

    Financial resilience is only part of the answer

    Recent results show considerable variation. Some businesses have improved profitability without much revenue growth. Others have expanded into adjacent electrical products, while several major lighting groups have experienced pressure on both sales and margins.

    Business Revenue development Operating profitability What the figures invite us to examine
    Signify €6.704bn in 2023 to €5.765bn in 2025 Adjusted EBITA margin: 10.0% to 8.9% Whether connected products and services can offset the contraction elsewhere
    Zumtobel Group €1.127bn in FY2023/24 to €1.040bn in FY2025/26 Adjusted EBIT margin: 5.1% to 4.1% Different recovery prospects in luminaires and components
    Fagerhult Group SEK8.560bn in 2023 to SEK7.891bn in 2025 Operating margin: 10.5% to 7.7% Whether a broad brand portfolio produces sufficient differentiation and returns
    Luceco £209.0m in 2023 to £271.4m in 2025 Adjusted operating margin: 11.5% to 12.5% How much growth comes from existing operations and how much from acquisitions
    F.W. Thorpe Approximately £175–177m across FY2023–FY2025 Statutory operating margin: approximately 15.8% to 18.3% How specialised delivery and service support profitability

    These are group figures, including international operations and, in some cases, substantial non-lighting activities. Fiscal calendars and profit definitions differ. The table compares each business with its own earlier performance; it is not a ranking of comparable European lighting margins. Sources: the company reporting resources listed below.

    Low growth is not necessarily poor management. A mature business can create considerable value through dependable cash generation and disciplined investment. However, leadership also involves developing future demand. A stronger margin after restructuring is welcome; it does not establish that customers have acquired a new reason to buy.

    Europe needs a broader proposition for light

    For building owners, the relevant decision is often whether an upgrade justifies disruption, installation costs and a long-term maintenance commitment. A more efficient luminaire helps, but the full proposition includes design, compatibility, commissioning, reliability and service.

    Europe’s renovation agenda creates room for that broader offer. The revised Energy Performance of Buildings Directive treats lighting and building automation within the wider performance of technical building systems. The commercial opportunity lies in helping owners achieve workable improvements in existing buildings, where equipment from different generations and suppliers must coexist. [1]

    This calls for practical innovation. Can an installer commission a system more quickly? Can an owner replace a failed component without replacing the entire installation? Can lighting work reliably with other building controls? Can a designer improve visual comfort while retaining flexibility for future changes of use?

    Environmental claims also need to become more tangible. Repairability, durable components, documented material choices and accessible maintenance can influence purchasing decisions when they reduce lifecycle cost or uncertainty. Repeating a general commitment to sustainability provides much less differentiation.

    Price competition deserves the same scrutiny. It can reflect excess capacity and purchasing pressure, but it can also reveal that buyers see too little difference between competing offers. Management cannot control the construction cycle. It can influence whether its products remain interchangeable in the customer’s eyes.

    Signify: a connected installed base still needs an economic case

    Signify illustrates the scale of the transition. Sales fell by approximately 14% between 2023 and 2025, while its adjusted EBITA margin declined from 10.0% to 8.9%. Free cash flow remained substantial: €586m in 2023, €438m in 2024 and €440m in 2025. Cash provides capacity to invest, but it does not remove the growth challenge. [2]

    The reported connected light-point base increased from 124 million in 2023 to 167 million in 2025. This is an important measure of deployment, but a cumulative installed base is not equivalent to recurring revenue or a disclosed number of paying software customers.

    The commercial test is whether connectivity improves retention, supports additional services and produces acceptable returns after development and support costs. The industry needs greater clarity on those outcomes before treating connected volume as proof of a transformed business model.

    Signify’s June 2026 strategy set medium-term ambitions of 0–1% comparable sales growth, approximately 10% adjusted EBITA margin and a 7–8% free-cash-flow margin. Those targets acknowledge a restrained growth environment. They also make the quality of resource allocation especially important. [39]

    As Tempelman’s arrival from the energy sector brings experience relevant to this broader agenda. His appointment creates an opportunity to connect lighting expertise with building and energy requirements. The evidence of success will come from execution, customer adoption and cash returns. [3]

    Zumtobel and Tridonic: two recovery challenges within one group

    Zumtobel’s results show why a group average can obscure the operating task. In FY2025/26, lighting revenue declined by 3.7%, yet adjusted EBIT rose from €51.3m to €54.7m. Components revenue fell by approximately 11%, with adjusted EBIT declining from €13.5m to €4.6m. The two businesses require different responses. [4]

    For professional luminaires, specification, design and application support can help defend value. For components, technical differentiation has to withstand demanding procurement processes and competitive pricing. A driver or control device becomes more valuable when it improves system performance or reduces integration effort; connectivity alone does not ensure pricing power.

    Heiner Lang joined the management board on 1 September 2026 and is scheduled to become CEO on 1 October. His industrial automation background is relevant to the group’s development, while preserving its optical and application knowledge will remain essential. [5]

    First-quarter FY2026/27 sales were €264.1m, down 0.9%, with adjusted EBIT of €8.2m and a 3.1% margin. These results precede the incoming CEO’s tenure and should be assessed accordingly. A leadership transition can establish priorities, but recovery must be demonstrated over subsequent reporting periods. [6]

    Fagerhult, Luceco and F.W. Thorpe: different routes to value

    Fagerhult’s portfolio includes businesses built around architectural specification, local professional markets and infrastructure. Its revenue fell by approximately 7.8% between 2023 and 2025, and operating cash flow declined from SEK1.209bn to SEK740m. Brand breadth has not insulated the group from weaker demand. [7]

    The acquisitions of Trato TLV and Capelon add exposure to specialised applications and connected outdoor lighting. Their strategic logic is understandable. Their long-term value depends on whether they improve customer access and capabilities at a return that justifies the capital invested.

    Multiple brands can preserve local expertise and distinct relationships with specifiers. They can also duplicate costs. The relevant question is whether each business has a clear role and whether shared resources make the portfolio more effective.

    Luceco presents a different picture. Revenue and adjusted operating profitability improved between 2023 and 2025, with free cash flow reaching £30.4m in 2025. Its activities extend across wiring accessories, LED lighting, EV charging and portable power. Acquisitions, including D-Line and CMD, contributed to the expansion. These are the results of a broader electrical-products business, not a measure of organic lighting-market growth. [8]

    Its experience makes adjacency worth studying. Products that share customers, installation channels and engineering capabilities may offer a credible route to expansion. Diversification becomes less convincing when it merely increases the number of separate businesses management must support.

    F.W. Thorpe offers another model. Revenue remained broadly stable across FY2023–FY2025, while statutory operating margins improved. In FY2025, operating cash flow was £33.2m and cash plus short-term financial assets reached £61.8m. [9]

    Thorlux’s offer extends from surveys and design through installation, commissioning and after-sales support. Continued development of SmartScan connects product engineering with the practical operation of installations. This is a concrete example of innovation within an established specialism.

    A useful vision does not require every lighting company to build a universal platform. It can involve doing a demanding application exceptionally well and making the customer’s work easier.

    The private companies complicate the story of decline

    Europe’s lighting industry cannot be understood through a few listed groups alone. Privately owned manufacturers and design businesses reveal different investment choices. Their financial disclosure is often less extensive, so historical scale and current operational developments need to be distinguished.

    TRILUX is a substantial example. DDW lists 2023 revenue of approximately €696.4m, a historical scale reference rather than a current audited performance assessment. More tangible recent evidence comes from the company’s investment programme: a Polish production and development site opened in September 2024 with approximately €32m invested and designed capacity of up to one million luminaires annually. [10] [11]

    In July 2026, TRILUX announced more than €80m of investment over three years at Arnsberg, covering its headquarters and production modernisation. Ansorg and Oktalite had also been brought together within TRILUX Retail. These are identifiable commitments of capital and organisational effort. Their value will depend on utilisation, development efficiency and customer demand, but they make a blanket accusation of industry inactivity difficult to sustain. [12] [13]

    SLV Lighting Group is pursuing integration across a different portfolio. Its predecessor, nnuks, reported turnover above €230m in 2021. That figure establishes historical group scale; it is neither current revenue nor the turnover of the SLV brand alone. [14]

    The group’s 2025 sustainability report describes five brands—SLV, Nordtronic, Novalux, unex lighting and Knightsbridge—and measures to share procurement, logistics and sales capabilities. Nordtronic and SLV are centralising purchasing and logistics, while SLV supports Novalux’s expansion beyond Italy. Knightsbridge also participates in wiring accessories. [15]

    The strategic opportunity is to make a multi-brand group more useful to installers and distributors through availability, range and service. Public disclosure does not yet allow those changes to be translated into a reliable assessment of recent group profitability.

    ERCO demonstrates the importance of application-specific product development. Its 2026 introductions include flexible linear track lighting for offices, further wallwashing applications and developments for display lighting. Those improvements address identifiable design and use requirements. [16]

    Its scale should nevertheless be described cautiously. A business index lists approximately €81.8m for ERCO GmbH in 2024, without sufficiently clarifying the consolidation boundary. The available evidence does not confirm current global brand revenue above €100m. ERCO belongs in the discussion for its professional significance, rather than an assumed revenue threshold. [17]

    FLOS combines an active design programme with the financial complexity of a wider luxury-design group. An Italian company database lists approximately €134.2m of 2024 revenue for FLOS S.p.A.; this is a secondary summary of a legal entity’s accounts, not verified global consolidated FLOS-brand turnover. Product launches continued through the 2025 and 2026 Milan design weeks. [18] [19]

    At Flos B&B Italia Group, the first-half 2026 continuing-business pro forma figures, excluding Louis Poulsen and Fendi Casa, show revenue of €270.2m, down 6.5%, and adjusted EBITDA of €50.1m, down 17.5%. The 18.5% EBITDA margin is a group measure encompassing furniture and other design activities; it must not be attributed to FLOS lighting alone. [20]

    The agreement to sell Louis Poulsen illustrates how ownership and financing influence even highly regarded brands. Announced in June 2026, the transaction was expected to close in the second half, subject to approvals. A disposal can support debt reduction and a new ownership horizon; it does not, by itself, establish that the brand has failed. [21]

    EGLO adds the mass-market decorative-lighting perspective. Its official company profile reports €523m of revenue for 2024 across a portfolio extending beyond lighting alone. Comparable profit and cash-flow figures are not supplied alongside that disclosure. Scale is clear; the quality of recent returns is less visible. [22]

    Specialisation and controls still offer room to grow

    Glamox’s holding company, GLX Holding, reported preliminary 2025 revenue and other operating income of NOK4.447bn, down 0.9%, with adjusted EBITA of NOK680m and a 15.3% margin. Orders increased by 4.9%, while operating cash flow declined from NOK691m to NOK497m. These different movements show why orders, earnings and cash need to be considered together. [23]

    Schréder, whose 2023 turnover was reported at €560m by EY, is extending its outdoor-lighting position through the acquisition of NLS Lighting, announced in April 2026. Local manufacturing and project access in North America provide a plausible complement to its technical capabilities. The transaction price was not disclosed. [24] [25]

    Plejd is a useful counterexample to the assumption that lighting-related markets offer little growth. Its 2025 net sales reached SEK935m, up 41.1%, with an EBIT margin of 24.6%. Management described the growth as organic and identified contributions from adjacent smart products and international expansion. It should therefore be understood as growth in a broader control and installation proposition, not simply stronger demand for luminaires. [26]

    Dexelance’s lighting activities also grew in 2025, reaching €34.3m from €32.1m. This is a smaller segment within a broader design group, but it reinforces the need to examine individual markets rather than assume uniform contraction. [27]

    Turnarounds need equally careful interpretation. Edison’s company-commissioned research on Dialight reports higher group underlying operating profit for the year to March 2026 despite lower revenue. However, lighting-segment revenue and underlying profit before central costs both declined. Improvement elsewhere in a group, or lower overheads, should not automatically be presented as a recovery in lighting demand. [28]

    LEDVANCE and Inventronics: ownership does not remove the European operating challenge

    Europe’s lighting ecosystem includes businesses with international ownership, engineering teams, manufacturing and customers. Their strategic significance rests on what they deliver in European markets.

    LEDVANCE retains substantial brand recognition, distribution relationships and local operating capabilities. Its parent’s product-line disclosure reports 2025 revenue of RMB9.25bn and a gross margin of approximately 40%. These are worldwide product figures reported in the parent’s currency, not European regional revenue or a standalone operating margin. [29]

    The first half of 2026 illustrates the importance of that distinction. LEDVANCE product-line revenue was RMB4.326bn, down 1.12%, while its gross margin fell to 39.82%, a decline of 2.80 percentage points. Gross profit decreased by approximately RMB142m. The parent group’s profit recovery therefore cannot establish a recovery in LEDVANCE’s lighting operations. Separate product-line net profit and cash flow were not disclosed. [30]

    Large acquisition-related impairments in the parent’s 2025 accounts also require care: a reduction in the carrying value of an acquisition-related asset group is not an equivalent amount of annual operating loss at LEDVANCE GmbH.

    For European customers, the more immediate questions concern product development, service and project execution. The acquisition of loblicht adds professional project capabilities. LEDVANCE’s August 2026 management announcement emphasised European B2B and project activity, alongside more efficient customer processes. [31]

    Its renewables range raises a further strategic question. Lighting, photovoltaics, inverters and storage can share some channels and customers, but commercial synergies need evidence. Public product availability does not establish material revenue or acceptable returns. [32]

    Inventronics faces a related task following its acquisition of the former ams OSRAM digital-systems business in Europe and Asia. The acquisition brought engineering, products and customer relationships, but those assets still have to earn their returns. Its subsequent transition from licensed OSRAM branding to Inventronics increases the importance of its own product reputation and service continuity. [38] [38] [38]

    For both businesses, the European test is practical: customer retention, competitive technical performance, reliable availability and profitable execution. Ownership changes and portfolio expansion can support those outcomes; they cannot substitute for them.

    IKEA and Kingfisher: the customer relationship is already broader than lighting

    The industry’s future competitors need not begin as specialist luminaire manufacturers. Home-furnishing and home-improvement businesses can place lighting inside a purchase journey customers already understand.

    IKEA reported worldwide retail sales of €44.6bn in FY2025, down approximately 1%, while volumes and customer numbers increased by around 3% following price reductions. These figures cover the whole IKEA retail system, including non-lighting activities; they say nothing directly about lighting profitability. [33]

    More significant for lighting strategy was IKEA’s November 2025 announcement of 21 Matter-compatible smart-home products, including 11 KAJPLATS bulbs, sensors and remotes. Its proposition brings connected lighting into an accessible home-furnishing context. [34]

    The competitive implication is an inference from that offer: a retailer that helps people choose, install and use a system can become the brand associated with the experience, while individual device suppliers become less visible. Product launches alone do not establish that IKEA has achieved this at scale or profitably.

    Kingfisher offers another view of channel influence. In the year ended 31 January 2026, group sales were £12.945bn and adjusted pre-tax profit £560m. B&Q sales reached £3.971bn, with like-for-like growth of 3.3%. Own exclusive brands represented 43% of group sales across categories, including ranges such as GoodHome and LAP. That percentage is not a lighting-market share. [35] [36]

    The next quarter was less favourable for B&Q: sales fell 3% as reported and 4.1% like for like, although e-commerce grew. Channel ownership does not eliminate exposure to household spending and renovation cycles. [37]

    Neither IKEA nor Kingfisher provides enough separate lighting information here to compare its lighting profitability with manufacturers. Their strategic relevance is nevertheless clear: they influence assortment, price, convenience and the customer relationship. Lighting brands need to demonstrate what additional value they bring within that environment.

    Leadership requires a commitment that customers can recognise

    The evidence does not support a claim that European lighting companies have stopped innovating. TRILUX’s investments, ERCO’s application work, F.W. Thorpe’s systems and service, and Plejd’s expansion all provide concrete counterexamples.

    The sharper concern is whether those efforts are sufficient, sustained and commercially effective. Research expenditure alone cannot answer this. Companies differ in their development cycles, accounting policies and mix of software, electronics and optical engineering.

    A credible vision should identify the customer problem, the resources committed and the conditions that will determine success. For a building owner, that might mean lower lifecycle cost and more dependable maintenance. For an installer, less commissioning time and fewer callbacks. For a specifier, better visual performance and clearer integration choices. For a household, an intuitive system that continues to work as devices change.

    Claims about wellbeing should be tied to measured lighting conditions and appropriate evidence. A controllable spectrum or a new product label does not establish a health outcome. Professional credibility depends on communicating what has actually been demonstrated.

    Boards also need to examine what restructuring preserves. Repeatedly reducing application engineering, software support and customer knowledge may protect current earnings while weakening the next product generation. Long-term projects require milestones and accountability, but they also require continuity.

    Europe’s strongest opportunity is to connect its existing expertise with the realities of occupied buildings. That involves partnerships with electrical, automation and building-service businesses; clearer responsibility for commissioning and maintenance; and products designed to remain useful within evolving systems.

    Traditional lighting manufacturers still have substantial advantages in optical performance, specification and application knowledge. New entrants have their own execution gaps. The eventual outcome is open.

    What should concern established leaders is the possibility of remaining technically capable while becoming commercially secondary—supplying devices into systems whose customer relationships and service revenues belong to someone else.

    The next generation of European lighting leadership will be earned through products and services that people can recognise as better, supported by investment that produces durable returns. The question for today’s leaders is whether their current decisions are building that future.

    Sources and reading notes

    The references distinguish company financial reports, product announcements and secondary scale estimates. Product and investment announcements establish actions or intentions, not proven financial returns. Figures retain their original currencies and reporting periods; group, brand, legal-entity and product-line disclosures are not interchangeable.

    For readers using a platform that does not support external links, copy the full address below into a browser. Some financial-report links open PDFs; long addresses should be copied in full.

    [1] EU Energy Performance of Buildings Directive
    Regulatory context for technical building systems; implementation and scope depend on the relevant provisions.
    https://eur-lex.europa.eu/eli/dir/2024/1275/oj

    [2] Signify reporting and announcements
    Company reporting archive; annual results supply the historical group figures.
    https://www.signify.com/global/our-company/news/press-releases

    [3] Signify: CEO appointment
    Background and timing of As Tempelman’s appointment.
    https://www.signify.com/global/our-company/news/press-releases/2025/20250528-signify-names-as-tempelman-as-chief-executive-officer

    [4] Zumtobel Group corporate information
    Company reporting and announcements; group and segment measures must be distinguished.
    https://z.lighting/en/group/investor-relations/

    [5] Zumtobel: Heiner Lang appointment
    Board entry and planned CEO succession dates.
    https://z.lighting/en-gb/group/news-insights/ir/supervisory-board-appoints-heiner-lang-ceo-zumtobel-group/

    [6] Zumtobel Q1 FY2026/27 results
    Quarterly figures preceding the incoming CEO’s tenure.
    https://z.lighting/documents/4085/Zumtobel_Group_-Press_releases-_Q1_2026-27.pdf

    [7] Fagerhult investor information
    Annual reporting, portfolio and acquisition information.
    https://www.fagerhultgroup.com/investors/

    [8] Luceco investor information
    Group reporting includes electrical products beyond lighting.
    https://www.lucecoplc.com/investors/

    [9] F.W. Thorpe annual report 2025
    Financial results, SmartScan and operating model.
    https://www.fwthorpe.co.uk/pdf/fw-thorpe-annual-report-2025.pdf

    [10] TRILUX company profile, DDW
    Secondary historical revenue estimate for 2023.
    https://die-deutsche-wirtschaft.de/unternehmen/trilux-gmbh-co-kg-arnsberg/

    [11] TRILUX sustainability report 2023/24
    Polish facility investment and capacity; pages 36–37.
    https://www.trilux.com/fileadmin/Downloads/Documents/Nachhaltigkeit/Sustainability_Report_2023-2024.pdf

    [12] TRILUX Arnsberg investment announcement
    Planned investment over three years, announced July 2026.
    https://www.trilux.com/de/blog/neubau-standort-arnsberg/

    [13] TRILUX Retail integration
    Brand and organisational changes.
    https://www.trilux.com/ch/blog/trilux-retail-migration/

    [14] nnuks sustainability report 2022
    Historical 2021 multi-brand group turnover.
    https://slv-lighting-group.com/wp-content/uploads/2022/06/NKS_BRO_Sustainability-2022_210x279.pdf

    [15] SLV Lighting Group sustainability report 2025
    Brand portfolio and procurement, logistics and sales integration; pages 8–11.
    https://a.storyblok.com/f/113144/x/f85bebdba1/slg_bro_sustainability-2025_210x279mm_72dpi.pdf

    [16] ERCO new products
    Application and product information; not financial evidence.
    https://www.erco.com/en/products/new-products/

    [17] ERCO business-index profile
    Secondary legal-entity figure with an unclear consolidation boundary.
    https://www.weltmarktfuehrerindex.de/profil/erco

    [18] FLOS S.p.A. company-account summary
    Secondary transcription of legal-entity accounts, not global brand revenue.
    https://www.reportaziende.it/flos_societa_per_azioni_bs_00290820174

    [19] FLOS at Milan Design Week 2026
    Product-development evidence.
    https://flos.com/en/wo/flos-at-milano-design-week-2026.html

    [20] Flos B&B Italia Group H1 2026 presentation
    Continuing-business pro forma results, pages 5 and 12; includes non-lighting businesses.
    https://www.flosbebitaliagroup.com/on/demandware.static/-/Library-Sites-DHCorp-contentlib/default/dw8ee7cc40/Investors/Reports%20and%20publications/1_presentation_Flos%20B%26B%20Italia%20S.p.A.%20-%20H1%202026_last.pdf

    [21] Louis Poulsen transaction: buyer’s adviser
    Announced transaction subject to completion conditions.
    https://accura.dk/en/cases/chr-augustinus-fabrikker-acquires-louis-poulsen/

    [22] EGLO official company profile
    Self-reported 2024 scale; no matching profit or cash-flow disclosure.
    https://lu.linkedin.com/company/eglo-leuchten-gmbh

    [23] GLX Holding preliminary 2025 results
    Holding-company reporting scope and preliminary results.
    https://www.glamox.com/news-and-stories/glx-holding-as-the-holding-company-of-glamox-closes-2025-with-improved-profitability-and-robust-performance/

    [24] EY profile of Schréder
    Historical 2023 turnover, published December 2024.
    https://www.ey.com/en_be/newsroom/2024/12/schreder-named-l-entreprise-de-l-annee-2024

    [25] Schréder acquisition of NLS Lighting
    Announced April 2026; price not disclosed.
    https://www.schreder.com/en/news/schreder-announces-acquisition-nls-lighting

    [26] Plejd year-end report 2025
    Reported growth, profitability and management explanation of organic expansion.
    https://news.cision.com/plejd/r/year-end-report-2025,c4296913

    [27] Dexelance investor presentation, April 2026
    Lighting-segment revenue, page 25.
    https://dexelance.com/wp-content/uploads/Investor-Presentation-DEXELANCE_v.-08.04.2026-FINAL-1.pdf

    [28] Edison research on Dialight
    Company-commissioned external research; group and lighting-segment results on pages 3–4.
    https://static.lse.co.uk/research/download/3653.pdf

    [29] MLS annual report 2025
    Listed parent’s product-line and acquisition-accounting disclosures, in Chinese.
    https://money.finance.sina.com.cn/corp/view/vCB_AllBulletinDetail.php?id=12234150&stockid=002745

    [30] MLS interim report 2026
    Product-line gross profit and consolidated group results, in Chinese.
    https://money.finance.sina.com.cn/corp/view/vCB_AllBulletinDetail.php?id=12563625&stockid=002745

    [31] LEDVANCE management announcement, August 2026
    Management responsibilities and European operating priorities.
    https://www.ledvance.com/en-uk/company/press/press-releases/2026/ledvance-strengthens-its-management-team-with-dr-markus-emmert-n479050

    [32] LEDVANCE Renewables announcement
    Product range and stated strategy, not separate financial results.
    https://www.ledvance.com/en-int/company/press/press-releases/2024/ledvance-introduces-ledvance-renewables–photovoltaics-for-a-brighter–greener-future-n303994

    [33] IKEA FY2025 retail sales
    Worldwide retail-system figures, not lighting-segment results.
    https://www.ikea.com/global/en/newsroom/corporate/ikea-retail-sales-fy25-251016/

    [34] IKEA smart-home product announcement
    November 2025 Matter-compatible range.
    https://www.ikea.com/global/en/newsroom/retail/the-new-smart-home-from-ikea-matter-compatible-251106/

    [35] Kingfisher annual report 2025/26
    Group and B&Q financial results; fiscal year ended January 2026.
    https://www.kingfisher.com/~/media/Files/K/Kingfisher-Plc/Universal/investors/result-reports-presentation/2026/2526-annual-report-and-accounts.pdf

    [36] Kingfisher own exclusive brands
    43% relates to group sales across categories, not lighting alone.
    https://www.kingfisher.com/our-banners-and-brands/own-exclusive-brands

    [37] Kingfisher Q1 2026/27 update
    Quarter ended April 2026; separate period from annual results.
    https://www.kingfisher.com/~/media/Files/K/Kingfisher-Plc/Universal/investors/result-reports-presentation/2026/2026-27-q1-trading-update.pdf

    [38] Inventronics annual reporting and acquisition information
    Company disclosures concerning acquired operations and subsequent performance; source in Chinese.
    https://cn.inventronics-co.com/news_info/33/1771.html

    [39] Signify strategy announcement, June 2026
    Medium-term growth, profitability and cash-flow targets are management objectives, not reported outcomes.
    https://www.signify.com/global/our-company/news/press-releases/2026/20260623-signify-introduces-strategy-to-create-a-more-focused-better-performing-company

  • 把光說清楚 13|健康照明/綜合照明基礎十八講

    「藍光」是風險、節律訊號,還是行銷話術?

    同一個字背後,其實有三套完全不同的問題

    作者|林紀良 Lawrence Lin

    GLGA 主席|GLG 董事會成員|IWBI WELL Light Concept Advisor|LRS 創辦人兼 CEO

    消費者拿著「防藍光」燈具問我:「既然藍光有害,白天為什麼又要提高 melanopic 刺激?」這不是自相矛盾,而是業界長期把三個概念都叫作「藍光」。

    藍光危害、晝夜節律相關刺激與螢幕視覺疲勞,需分別討論。波長區間可能重疊,作用機轉、劑量、評估方法和風險情境卻不同。


    藍光危害:討論視網膜光化學損傷

    CIE 所說的 blue-light hazard,特別指光化學性視網膜損傷風險,採用對應危害加權函數及輻亮度/輻照度評估。它不等同於睡眠影響,也不等於「看螢幕會累」。

    在可預見的正常使用條件下,白光普通照明通常不會構成藍光危害。

    高強度特殊光源、近距離觀察或特定工業環境仍需依 IEC 62471 等要求評估,不能用上述結論一概排除。


    節律相關刺激:討論時間與暴露

    黑視素路徑對短波可見光較敏感,但應使用 CIE S 026 的 melanopic 量描述,而不是籠統說「藍光多」。

    白天適當的光暴露與夜晚降低暴露,是時間策略;它不能直接用藍光危害等級代替。

    同樣,夜間減少螢幕影響,不只是在螢幕上加一層黃色。亮度、觀看距離、持續時間、內容引發的心理喚醒,以及整個房間的光線都很重要。


    視覺疲勞:往往不是一條波段的問題

    乾眼、眨眼減少、字體過小、反射眩光、近距離用眼過久和姿勢,都可能造成不適。

    把所有疲勞歸咎於藍光,容易讓真正有效的改善措施被忽略。

    負責任的「低藍光」產品,應說明降低的是哪一段光譜、犧牲了什麼顏色表現、適用於哪個時段,以及依據的測試方法。


    目前可以說/還不能說

    目前可以說: 藍光危害有特定安全定義;melanopic 刺激有獨立計量;視覺疲勞是多因素問題。

    還不能說: 普通白光照明中的藍光必然會損傷視網膜,或「去藍光」就能解決睡眠與眼睛疲勞。


    今天就能做的三件事

    • 聽到「藍光」時,先問討論的是光生物安全、節律,還是視覺舒適。
    • 特殊高強度光源依 IEC 62471 系列做風險分組,不用行銷標籤替代。
    • 晚間優先降低整體亮度和暴露時長,再優化光譜。

    證據標籤:已有共識。
    三類問題應分開計量與溝通。


    參考資料

    • CIE Position Statement on Blue Light Hazard :https://cie.co.at/publications/position-statement-blue-light-hazard-april-23-2019
    • IEC 62471-7:2023 :https://webstore.iec.ch/en/publication/68810
    • CIE S 026:2018 :https://www.cie.co.at/publications/cie-system-metrology-optical-radiation-iprgc-influenced-responses-light-0

    下一篇,我們來看另一個常被一句「無頻閃」帶過的問題:看不見的閃爍,為什麼仍可能影響照明品質?

  • 把光說清楚 12|健康照明/綜合照明基礎十八講

    全光譜不等於健康,色溫也不是處方

    讓光譜回到可測量的特徵,不再承擔過度承諾

    作者|林紀良 Lawrence Lin

    GLGA 主席|GLG 董事會成員|IWBI WELL Light Concept Advisor|LRS 創辦人兼 CEO

    「我們這款燈是全光譜,所以更護眼、更助眠、更接近日光。」這類介紹很常見。全光譜聽起來完整、自然,也因此很容易承載超出證據的想像。

    「全光譜」目前在市場傳播中並不是一個自動對應健康結果的統一處方。評估光譜,應回到特定指標:色彩還原、色域、特定波段分佈、mel-DER,以及不同運作狀態下的整體表現。


    連續,不等於適合所有時段

    一條看起來連續平滑的光譜,可能帶來良好色彩體驗;但是否適合上午辦公室、晚間住宅或博物館展陳,仍取決於數量、方向、時間和物體。

    日光本身也不是一条固定曲线,它随天气、时刻、朝向和天空条件变化。

    「像日光」若沒有指定比較條件,就很難成為嚴謹結論。更何況,夜間臨睡前的目標並不是複製正午日光,而是降低不必要的光暴露。


    CCT 不能取代光譜

    兩款 3000 K 光源可以有不同的色彩保真度、色域和 mel-DER。

    相反,一款 4000 K 產品經過合理調暗,眼睛接收的 mel-EDI 可能低於一款沒有調暗的 2700 K 產品。

    色溫會影響色貌與氛圍,但不是生理劑量。

    顏色品質也不宜只看一般顯色指數 Ra。 CIE 已建議在過渡期同時報告 CIE Rf 與 Ra;若專案關心色彩偏好和鮮豔度,還需要更完整的色域與色相資訊。


    產品比較該問什麼

    索取機器可讀的光譜數據,而不只是圖片;

    確認資料對應的功率、色溫和調光檔位;

    查看顏色保真度、色域、mel-DER、效率和時間光調變是否同時可接受。

    若供應商聲稱改善睡眠或認知,也要問人體證據的對象、場景和長度。

    真正專業的產品,不怕把邊界寫清楚。


    目前可以說/還不能說

    目前可以說: 光譜形狀會影響色彩表現和 α-opic 刺激;完整光譜資料比「全光譜」標籤更有工程價值。

    還不能說: 只要光譜連續、CCT 接近日光或 Ra 很高,就必然護眼、助眠或適合全天使用。


    今天就能做的三件事

    • 把「全光譜」改寫成可驗證的光譜、顏色和 α-opic 指標。
    • 比較調光調色產品時,檢查每個關鍵場景,而不只檢查額定狀態。
    • 面向消費者時,把「呈現自然、顏色真實」和「醫學健康效果」分開表達。

    證據標籤:已有共識/開放問題。
    光譜可準確計量;單一市場標籤與長期健康結局之間沒有自動等號。


    參考資料

    • CIE PS 002:2025 :https://www.cie.co.at/publications/cie-ps-0022025-cie-position-statement-colour-quality-metrics-2nd-edition
    • CIE S 026:2018 :https://www.cie.co.at/publications/cie-system-metrology-optical-radiation-iprgc-influenced-responses-light-0
    • CIE 253:2024 — Technical Reports :https://cie.co.at/publications/technical-reports

    下一篇,我們繼續拆一個更容易引發焦慮的詞:藍光到底是風險、節奏訊號,還是行銷話術?

  • 把光說清楚 11|健康照明/綜合照明基礎十八講

    綜合照明,首先必須是好照明

    沒有視覺質量,所有健康目標都站不穩

    作者|林紀良 Lawrence Lin

    GLGA 主席|GLG 董事會成員|IWBI WELL Light Concept Advisor|LRS 創辦人兼 CEO

    某办公室为了提高眼睛处的光暴露,在员工正前方增加了一块很亮的发光面。测量数值漂亮了,员工却开始戴帽子、关灯,甚至用纸板遮挡。设计达到了计算值,却失去了使用者。

    綜合照明不是在傳統照明之上再加一個數字。它首先要滿足可見度、舒適、安全與空間品質,然後才談適時的非視覺刺激。讓人主動逃避的方案,很難長期產生預期效果。


    好照明有幾條不能失去的底線

    照度要與任務相符,分佈不能讓眼睛頻繁在極亮與極暗之間適應;眩光要受控,屏幕與光澤表面不能產生幹擾反射;顯色應支持辨識人物、材料和警示信息;時間光調製不能製造明顯閃爍或頻閃效應。

    此外,空間需要有層次。均勻不等於把每個表面照成一樣亮,動態也不等於每十分鐘改變一次色溫。人的注意、方向感與環境氛圍,往往來自於有秩序的亮度關係。


    指標之間需要平衡

    提高垂直照度可能增加眩光;提高牆面亮度可能增加能耗;改變光譜可能影響顯色和系統效率;過度調光又可能放大某些驅動器的時間光調製。

    工程設計的價值,正是在這些限制中尋找整體最優,而非追逐單項冠軍。

    這也是 CIE 所說「proper light at the proper time」的完整意義:正確的光,不只有數量和時刻,還包括品質與使用環境。


    用戶行為是最終裁判之一

    如果使用者經常拉簾、關閉自動控制、遮擋燈具,首先要了解原因。

    眩光、溫度、隱私、螢幕反射或控制邏輯都可能讓設計意圖失效。回訪不是軟性加分項,而是驗證系統是否真正運作的證據。


    目前可以說/還不能說

    目前可以說: 綜合照明應同時滿足視覺舒適、任務表現、安全、節律相關目標、能源與建築條件。

    還不能說: 為達到一個 melanopic 數值,可以合理犧牲眩光、顯色、閃爍控製或使用者自主性。


    今天就能做的三件事

    • 建立包含照度、眩光、顯色、時間光調變、控制與 mel-EDI 的聯合檢查表。
    • 樣板測試時讓真實使用者坐、看、操作,而不只讓儀器讀數。
    • 驗收後安排回訪,觀察遮燈、關燈與拉簾等「反設計行為」。

    證據標籤:已有共識。
    綜合照明的前提,是滿足整體照明品質。


    參考資料

    • CIE PS 001:2024: https://cie.co.at/publications/cie-position-statement-integrative-lighting-recommending-proper-light-proper-time-3rd
    • ISO/CIE 8995-1:2025: https://www.iso.org/standard/76342.html
    • GB/T 50034—2024 Publication Information: https://sczjjgfw.gov.cn/clas/wjhb/jsb/24/jsb202433.html

    下一篇,我們處理市面上最響亮的詞之一:為什麼全光譜不自動等於健康,色溫又為什麼不是藥方?