{"id":2607,"date":"2026-01-13T07:12:07","date_gmt":"2026-01-13T07:12:07","guid":{"rendered":"https:\/\/lightingrecipe.com\/?page_id=2607"},"modified":"2026-01-21T08:17:43","modified_gmt":"2026-01-21T08:17:43","slug":"illuminance-cct-and-cri","status":"publish","type":"page","link":"https:\/\/lightingrecipe.com\/de\/illuminance-cct-and-cri\/","title":{"rendered":"Beleuchtungsst\u00e4rke, korrelierte Farbtemperatur (CCT) und Farbwiedergabeindex (CRI)"},"content":{"rendered":"<div class=\"wp-block-columns alignwide is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:100%\">\n<p class=\"has-black-color has-text-color has-link-color has-medium-font-size wp-elements-0adb6ec2fd7e5e8cc59c15c1ef82e664\"><strong><em>Was ist die Beleuchtungsst\u00e4rke (Illuminance)?<\/em><\/strong><\/p>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-1f03d587bf1c746b16db9872c9796f1c\" style=\"font-size:15px\"><br><br>Die Beleuchtungsst\u00e4rke (Illuminance) bezeichnet den gesamten Lichtstrom, der pro Fl\u00e4cheneinheit auf eine Oberfl\u00e4che trifft. Sie misst, wie viel Licht auf eine Fl\u00e4che f\u00e4llt, gewichtet nach der Empfindlichkeit des menschlichen Auges gegen\u00fcber unterschiedlichen Wellenl\u00e4ngen (der photopischen Hellempfindlichkeitsfunktion). Einfach ausgedr\u00fcckt: Beleuchtungsst\u00e4rke ist die Lichtmenge, die auf eine bestimmte Oberfl\u00e4che f\u00e4llt.<br><br>Die SI-Einheit der Beleuchtungsst\u00e4rke ist Lux (lm\/m\u00b2). In Regionen, die das US-amerikanische Ma\u00dfsystem verwenden, wird auch die Einheit Foot-Candle genutzt. Sie entspricht einem Lumen pro Quadratfu\u00df und betr\u00e4gt etwa 10,764 Lux.<br><\/p>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color has-medium-font-size wp-elements-6425a3ac9cc6c0454814a9cc13d564e4\"><br><strong><em>Was ist die korrelierte Farbtemperatur (CCT \u2013 Correlated Color Temperature)?<\/em><\/strong><\/p>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-310f8d18ab6a89de49a7fbf97f3239c9\" style=\"font-size:15px\"><br><br>Die korrelierte Farbtemperatur (CCT) beschreibt den Farbeindruck einer Lichtquelle. Sie basiert auf der Temperatur (in Kelvin) eines idealen schwarzen Strahlers, der eine \u00e4hnliche Farbwirkung erzeugt.\nEinfach gesagt gibt die CCT an, ob eine Lichtquelle warm (gelb-\/r\u00f6tliche T\u00f6ne) oder k\u00fchl (bl\u00e4uliche T\u00f6ne) erscheint \u2013 abh\u00e4ngig von ihrer Farbtemperatur.<br><br>Die SI-Einheit der Temperatur ist das Kelvin (K).<\/p>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-be8c580be74a297b8b617babcd5f0ae1\" style=\"font-size:15px\">\ud83d\udd39 Warm und behaglich (2200K\u20132700K): Schafft eine entspannte, einladende Atmosph\u00e4re. Geeignet f\u00fcr Wohnr\u00e4ume, Schlafzimmer und Essbereiche.<\/p>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-05dad23ac10831d4209501afad873f72\" style=\"font-size:15px\">\ud83d\udd39 Neutralwei\u00df (3000K\u20133500K): Ein ausgewogenes Licht f\u00fcr die allgemeine Beleuchtung in B\u00fcros, K\u00fcchen und Verkaufsr\u00e4umen.<\/p>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-cba1b55dd64d1c8f705a4977f2014269\" style=\"font-size:15px\">\ud83d\udd39 Kaltwei\u00df (4000K\u20134500K): Scharfes, fokussiertes Licht, geeignet f\u00fcr Arbeitsaufgaben, Arbeitspl\u00e4tze und Garagen.<\/p>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-7c93ae84c0e83c04f6dcacac06b41eee\" style=\"font-size:15px\">\ud83d\udd39 Tageslicht \/ Au\u00dfenbeleuchtung (5000K\u20136500K): Imitiert nat\u00fcrliches Tageslicht; ideal f\u00fcr Au\u00dfenbeleuchtung, Parkfl\u00e4chen und Sportanlagen.<\/p>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-61e86a58bf09354602fdf196d2d28532\" style=\"font-size:15px\"><\/p>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color has-medium-font-size wp-elements-165c3d1e946f41dac0e92cbd7ed0e0d0\"><strong><em>Was ist der CRI (Farbwiedergabeindex)?<\/em><\/strong><\/p>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-fc77de9930f8e0488b0cfc212fdb9db0\" style=\"font-size:15px\"><br>Der Farbwiedergabeindex (CRI) quantifiziert, wie genau eine Lichtquelle die nat\u00fcrlichen Farben von Objekten im Vergleich zu einer Referenzlichtquelle, wie z. B. Tageslicht, wiedergibt.\nDer CRI wird durch das Spektrum der Lichtquelle bestimmt.<\/p>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-1853f3af8a47a782c268ce09300d8a9b\" style=\"font-size:15px\"><br>Der Index wird auf einer Skala von 0 bis 100 gemessen, wobei ein Wert von 100 bedeutet, dass die Farben von Objekten unter der Lichtquelle genauso erscheinen wie unter nat\u00fcrlichem Tageslicht.\nIn der Praxis gelten Lichtquellen mit einem CRI von 80 bis 90 als gut, w\u00e4hrend ein CRI von 90 oder h\u00f6her als ausgezeichnet eingestuft wird.<\/p>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-d66a4871bbb1d4815e7d5e7617820135\" style=\"font-size:15px\"><br>Allgemeine Faustregel: <em><strong>Je h\u00f6her der CRI, desto besser ist die Farbwiedergabef\u00e4higkeit.<\/strong><\/em>.<br><br>Der am h\u00e4ufigsten verwendete CRI-Wert ist CIE Ra.\nDer Farbwiedergabeindex Ra (allgemeiner Referenzwert) wird aus dem Mittelwert der ersten acht Testfarben (R1\u2013R8) berechnet.\n\nGem\u00e4\u00df der Beleuchtungsnorm EN 12464-1 ist f\u00fcr die meisten T\u00e4tigkeiten ein Mindestwert von Ra \u2265 80 erforderlich.\n\nWeitere Testfarben (R9\u2013R15) gehen nicht in die Ra-Berechnung ein, darunter: R9: ges\u00e4ttigtes Rot,  R13: Hautfarbe (hell), R15: Hautfarbe (mittel)\n\nDas bedeutet, dass eine Lichtquelle trotz eines hohen CRI-Werts eine schlechte Wiedergabe roter Farbt\u00f6ne aufweisen kann.\nDaher betrachten Lichtplaner und Beleuchtungsfachleute neben dem CRI h\u00e4ufig auch den R9-Wert.<br><br>Der Mittelwert aller 15 Testfarben wird als Re (erweiterter Referenzwert) angegeben und erm\u00f6glicht eine pr\u00e4zisere Bewertung der Lichtqualit\u00e4t.<br><\/p>\n<\/div>\n<\/div>\n\n\n\n<figure class=\"wp-block-video alignwide\"><video height=\"1080\" style=\"aspect-ratio: 1920 \/ 1080;\" width=\"1920\" controls src=\"https:\/\/lightingrecipe.com\/wp-content\/uploads\/2025\/07\/Light-fundamental-part-1.mp4\"><\/video><\/figure>","protected":false},"excerpt":{"rendered":"<p>What is Illuminance ? Illuminance refers to the total luminous flux incident on a surface, per unit area. It measures how much light falls on a surface, weighted by the human eye\u2019s sensitivity to different wavelengths (the luminosity function). In simple terms: Illuminance is the amount of light that falls on a given surface. The SI unit of illuminance is lux (lumens per square metre). A foot-candle, used in regions following United States customary units, is another unit of illuminance and is equal to one lumen per square foot\u2014approximately 10.764 lux. What is CCT (Correlated Color Temperature)? Correlated Color Temperature (CCT) describes the color appearance of a light source, based on the temperature (in Kelvin) of an ideal black-body radiator emitting a similar hue. In simpler words: CCT tells us whether a light source appears warm (yellow\/red tones) or cool (blue tones), based on its temperature. The SI unit is Kelvin (K). \ud83d\udd39Warm and Cozy (2200K\u20132700K): Creates a relaxed, inviting atmosphere. Ideal for homes, bedrooms, and dining spaces. \ud83d\udd39Neutral White (3000K\u20133500K): A balanced light used for general illumination in offices, kitchens, and retail spaces. \ud83d\udd39Cool White (4000K\u20134500K): Sharp, focused lighting suited for tasks, workstations, and garages. \ud83d\udd39Daylight\/Outdoor (5000K\u20136500K): Mimics daylight; perfect for outdoor lighting, parking areas, and sports facilities. What is CRI (Color Rendering Index)? The Color Rendering Index (CRI) quantifies how accurately a light source reveals the true colors of objects compared to a reference light, such as natural daylight. The CRI is determined by the light source&#8217;s spectrum. The index is measured from 0 to 100, with a perfect score of 100 indicating that the colors of objects under the light source appear the same as they would under natural sunlight. Typically, light sources with a CRI of 80 to 90 are considered good, and those with a CRI of 90+ are considered excellent. General rule: The higher the CRI, the better the color rendering capability. The most commonly used CRI value is CIE Ra. The color rendering index Ra (general reference) is calculated from the mean of the first eight test colors (R1\u2013R8). According to the EN 12464-1 lighting standard, a minimum Ra value of \u2265 80 is required for most activities. Other test colors (R9 to R15) are not included in the Ra calculation. These include: R9 \u2013 saturated red, R13 \u2013 skin color (light), and R15 \u2013 skin color (medium). This means a light source could have a high CRI score but still perform poorly when rendering red tones. That\u2019s why lighting professionals often look at the R9 value in addition to the CRI. The average of all 15 test colors is expressed as the Re value (reference extended), which enables a more precise evaluation of light quality.<\/p>","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_glsr_average":0,"_glsr_ranking":0,"_glsr_reviews":0,"footnotes":""},"class_list":["post-2607","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Illuminance, CCT, and CRI -<\/title>\n<meta name=\"robots\" content=\"noindex, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"de_DE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Illuminance, CCT, and CRI -\" \/>\n<meta property=\"og:description\" content=\"What is Illuminance ? Illuminance refers to the total luminous flux incident on a surface, per unit area. It measures how much light falls on a surface, weighted by the human eye\u2019s sensitivity to different wavelengths (the luminosity function). In simple terms: Illuminance is the amount of light that falls on a given surface. The SI unit of illuminance is lux (lumens per square metre). A foot-candle, used in regions following United States customary units, is another unit of illuminance and is equal to one lumen per square foot\u2014approximately 10.764 lux. What is CCT (Correlated Color Temperature)? Correlated Color Temperature (CCT) describes the color appearance of a light source, based on the temperature (in Kelvin) of an ideal black-body radiator emitting a similar hue. In simpler words: CCT tells us whether a light source appears warm (yellow\/red tones) or cool (blue tones), based on its temperature. The SI unit is Kelvin (K). \ud83d\udd39Warm and Cozy (2200K\u20132700K): Creates a relaxed, inviting atmosphere. Ideal for homes, bedrooms, and dining spaces. \ud83d\udd39Neutral White (3000K\u20133500K): A balanced light used for general illumination in offices, kitchens, and retail spaces. \ud83d\udd39Cool White (4000K\u20134500K): Sharp, focused lighting suited for tasks, workstations, and garages. \ud83d\udd39Daylight\/Outdoor (5000K\u20136500K): Mimics daylight; perfect for outdoor lighting, parking areas, and sports facilities. What is CRI (Color Rendering Index)? The Color Rendering Index (CRI) quantifies how accurately a light source reveals the true colors of objects compared to a reference light, such as natural daylight. The CRI is determined by the light source&#8217;s spectrum. The index is measured from 0 to 100, with a perfect score of 100 indicating that the colors of objects under the light source appear the same as they would under natural sunlight. Typically, light sources with a CRI of 80 to 90 are considered good, and those with a CRI of 90+ are considered excellent. General rule: The higher the CRI, the better the color rendering capability. The most commonly used CRI value is CIE Ra. The color rendering index Ra (general reference) is calculated from the mean of the first eight test colors (R1\u2013R8). According to the EN 12464-1 lighting standard, a minimum Ra value of \u2265 80 is required for most activities. Other test colors (R9 to R15) are not included in the Ra calculation. These include: R9 \u2013 saturated red, R13 \u2013 skin color (light), and R15 \u2013 skin color (medium). This means a light source could have a high CRI score but still perform poorly when rendering red tones. That\u2019s why lighting professionals often look at the R9 value in addition to the CRI. The average of all 15 test colors is expressed as the Re value (reference extended), which enables a more precise evaluation of light quality.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/lightingrecipe.com\/de\/illuminance-cct-and-cri\/\" \/>\n<meta property=\"article:modified_time\" content=\"2026-01-21T08:17:43+00:00\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Gesch\u00e4tzte Lesezeit\" \/>\n\t<meta name=\"twitter:data1\" content=\"2\u00a0Minuten\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/lightingrecipe.com\\\/illuminance-cct-and-cri\\\/\",\"url\":\"https:\\\/\\\/lightingrecipe.com\\\/illuminance-cct-and-cri\\\/\",\"name\":\"Illuminance, CCT, and CRI -\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/lightingrecipe.com\\\/#website\"},\"datePublished\":\"2026-01-13T07:12:07+00:00\",\"dateModified\":\"2026-01-21T08:17:43+00:00\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/lightingrecipe.com\\\/illuminance-cct-and-cri\\\/#breadcrumb\"},\"inLanguage\":\"de\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/lightingrecipe.com\\\/illuminance-cct-and-cri\\\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/lightingrecipe.com\\\/illuminance-cct-and-cri\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/lightingrecipe.com\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Illuminance, CCT, and CRI\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/lightingrecipe.com\\\/#website\",\"url\":\"https:\\\/\\\/lightingrecipe.com\\\/\",\"name\":\"\",\"description\":\"\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/lightingrecipe.com\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"de\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Illuminance, CCT, and CRI -","robots":{"index":"noindex","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"og_locale":"de_DE","og_type":"article","og_title":"Illuminance, CCT, and CRI -","og_description":"What is Illuminance ? Illuminance refers to the total luminous flux incident on a surface, per unit area. It measures how much light falls on a surface, weighted by the human eye\u2019s sensitivity to different wavelengths (the luminosity function). In simple terms: Illuminance is the amount of light that falls on a given surface. The SI unit of illuminance is lux (lumens per square metre). A foot-candle, used in regions following United States customary units, is another unit of illuminance and is equal to one lumen per square foot\u2014approximately 10.764 lux. What is CCT (Correlated Color Temperature)? Correlated Color Temperature (CCT) describes the color appearance of a light source, based on the temperature (in Kelvin) of an ideal black-body radiator emitting a similar hue. In simpler words: CCT tells us whether a light source appears warm (yellow\/red tones) or cool (blue tones), based on its temperature. The SI unit is Kelvin (K). \ud83d\udd39Warm and Cozy (2200K\u20132700K): Creates a relaxed, inviting atmosphere. Ideal for homes, bedrooms, and dining spaces. \ud83d\udd39Neutral White (3000K\u20133500K): A balanced light used for general illumination in offices, kitchens, and retail spaces. \ud83d\udd39Cool White (4000K\u20134500K): Sharp, focused lighting suited for tasks, workstations, and garages. \ud83d\udd39Daylight\/Outdoor (5000K\u20136500K): Mimics daylight; perfect for outdoor lighting, parking areas, and sports facilities. What is CRI (Color Rendering Index)? The Color Rendering Index (CRI) quantifies how accurately a light source reveals the true colors of objects compared to a reference light, such as natural daylight. The CRI is determined by the light source&#8217;s spectrum. The index is measured from 0 to 100, with a perfect score of 100 indicating that the colors of objects under the light source appear the same as they would under natural sunlight. Typically, light sources with a CRI of 80 to 90 are considered good, and those with a CRI of 90+ are considered excellent. General rule: The higher the CRI, the better the color rendering capability. The most commonly used CRI value is CIE Ra. The color rendering index Ra (general reference) is calculated from the mean of the first eight test colors (R1\u2013R8). According to the EN 12464-1 lighting standard, a minimum Ra value of \u2265 80 is required for most activities. Other test colors (R9 to R15) are not included in the Ra calculation. These include: R9 \u2013 saturated red, R13 \u2013 skin color (light), and R15 \u2013 skin color (medium). This means a light source could have a high CRI score but still perform poorly when rendering red tones. That\u2019s why lighting professionals often look at the R9 value in addition to the CRI. The average of all 15 test colors is expressed as the Re value (reference extended), which enables a more precise evaluation of light quality.","og_url":"https:\/\/lightingrecipe.com\/de\/illuminance-cct-and-cri\/","article_modified_time":"2026-01-21T08:17:43+00:00","twitter_card":"summary_large_image","twitter_misc":{"Gesch\u00e4tzte Lesezeit":"2\u00a0Minuten"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/lightingrecipe.com\/illuminance-cct-and-cri\/","url":"https:\/\/lightingrecipe.com\/illuminance-cct-and-cri\/","name":"Illuminance, CCT, and CRI -","isPartOf":{"@id":"https:\/\/lightingrecipe.com\/#website"},"datePublished":"2026-01-13T07:12:07+00:00","dateModified":"2026-01-21T08:17:43+00:00","breadcrumb":{"@id":"https:\/\/lightingrecipe.com\/illuminance-cct-and-cri\/#breadcrumb"},"inLanguage":"de","potentialAction":[{"@type":"ReadAction","target":["https:\/\/lightingrecipe.com\/illuminance-cct-and-cri\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/lightingrecipe.com\/illuminance-cct-and-cri\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/lightingrecipe.com\/"},{"@type":"ListItem","position":2,"name":"Illuminance, CCT, and CRI"}]},{"@type":"WebSite","@id":"https:\/\/lightingrecipe.com\/#website","url":"https:\/\/lightingrecipe.com\/","name":"","description":"","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/lightingrecipe.com\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"de"}]}},"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/lightingrecipe.com\/de\/wp-json\/wp\/v2\/pages\/2607","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lightingrecipe.com\/de\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/lightingrecipe.com\/de\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/lightingrecipe.com\/de\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/lightingrecipe.com\/de\/wp-json\/wp\/v2\/comments?post=2607"}],"version-history":[{"count":3,"href":"https:\/\/lightingrecipe.com\/de\/wp-json\/wp\/v2\/pages\/2607\/revisions"}],"predecessor-version":[{"id":2688,"href":"https:\/\/lightingrecipe.com\/de\/wp-json\/wp\/v2\/pages\/2607\/revisions\/2688"}],"wp:attachment":[{"href":"https:\/\/lightingrecipe.com\/de\/wp-json\/wp\/v2\/media?parent=2607"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}