In design and architecture, we constantly discuss “Healthy buildings” and “Human-centered spaces”, yet one core element is often overlooked—the lighting environment.
Most lighting design still relies on fixture specifications: color temperature, brightness, CRI, and so on.
However, what truly affects human health and perception is not the data printed on a luminaire box— but the actual light people receive.
And that light is continually shaped by installation height and illumination angle, reflected surfaces, color absorption, control settings, and how illumination shifts throughout the day.
In other words—the light shown in a design plan is often different from the light the human body actually perceives.
Therefore, the designer’s role is to translate specifications into a “light environment at eye level” (or “light environment from the eye’s perspective”).
Delivering not just the “Luminaire List”—but also the “Light Health Report.”
Before (Pre-design)
- Pre-assessment: Simulate spectral and illuminance distribution
- Support designers in planning the circadian lighting recipe
During (Design and Construction)
- On-site verification: Vertical illuminance, m-EDI, S/P ratio
- Identify gaps immediately between specifications and real-world performance
After (Post-delivery Verification)
- User Confidence:
- Benchmark lighting performance against WELL v2 and national standards
- Provide clients with a Healthy Light Environment Report
- Designer Benefit:
- Visualize outcomes and strengthen professional credibility
💡 Why measure light on-site?
The International WELL Building Institute (IWBI) highlighted in its latest report:
“Investing in health pays back.”
On average, every $1 invested in healthier environments returns 3–6× improvements in productivity and wellbeing.
And the first step toward these returns is quantification.
Only through on-site measurement can we verify:
• Whether the space’s circadian-effective light dose (m-EDI / EML) meets requirements
• Whether flicker, contrast, or color distortion create visual stress
• Whether spectral quality supports mood, alertness, and sleep
This is the crucial gap between healthy lighting design and the products used.
To make “health” more than a marketing slogan—it must be data-driven and measurable.
⚙️ In.Licht Ultra:
A full optical laboratory in your hand
Developed by Lighting Recipe Studio (LRS), the In.Licht Ultra Healthy Light Spectrometer was created to bridge this gap.
It is the world’s first handheld spectrometer certified by IWBI’s “Works with WELL” program, capable of measuring 23 core lighting parameters, including:
📊 Comprehensive Light-Quality Metrics: CCT, illuminance, CRI, TM-30 Rf/Rg, Duv, SPD
🌙 Circadian Metrics: m-EDI, EML, CS, CAF
⚡ Flicker Safety: Pst LM, SVM, Percent Flicker
🧠 Physiological Impact Analysis: S/P ratio, RG blue-light risk classification
Designed specifically for real-world environments: handheld, desktop-ready, or mountable on the WELL calibration stand.
This allows accurate measurement on tabletops or at eye-level vertical planes— the exact requirement for WELL Performance Verification (PV).
🧾 Professional Certification & Annual Calibration
In.Licht Ultra is officially calibrated by:
• Shanghai Institute of Measurement and Testing Technology (SIMT)
• East China National Metrology Testing Center
Measurement traceability is aligned with national standards, ensuring full credibility for project acceptance, WELL scoring, and international research.
LRS also provides annual factory calibration with TAF-accredited reports, enabling designers, light-source manufacturers, control-system suppliers, and WELL APs to maintain long-term professional reliability.
🌈 The Future: Integrating Light & Health into Every Space
In.Licht Ultra is more than an instrument— it is a bridge between luminaire engineering, design creativity, and human physiology.
• For LED manufacturers, it is a tool for quality validation and standardization
• For designers and WELL APs, it is the foundation for design and performance verification
• For building operators, it is a dashboard for ongoing health-performance monitoring
When design no longer relies solely on product data but centers on human experience, the value of healthy lighting will finally be quantifiable and visible.