{"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\/zh_cn\/illuminance-cct-and-cri\/","title":{"rendered":"\u7167\u5ea6\u3001\u76f8\u5173\u8272\u6e29\uff08CCT\uff09\u548c\u663e\u8272\u6307\u6570\uff08CRI\uff09"},"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>\u4ec0\u4e48\u662f\u7167\u5ea6\uff08Illuminance\uff09\uff1f<\/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>\u7167\u5ea6\uff08Illuminance\uff09\u662f\u6307\u5355\u4f4d\u9762\u79ef\u4e0a\u6240\u63a5\u6536\u5230\u7684\u603b\u5149\u901a\u91cf\u3002\u5b83\u7528\u4e8e\u8861\u91cf\u6709\u591a\u5c11\u5149\u7167\u5c04\u5230\u67d0\u4e00\u8868\u9762\uff0c\u5e76\u6839\u636e\u4eba\u773c\u5bf9\u4e0d\u540c\u6ce2\u957f\u7684\u654f\u611f\u5ea6\uff08\u89c6\u89c1\u51fd\u6570\uff09\u8fdb\u884c\u52a0\u6743\u3002\u7b80\u800c\u8a00\u4e4b\uff1a\u7167\u5ea6\u5c31\u662f\u843d\u5728\u67d0\u4e00\u8868\u9762\u4e0a\u7684\u5149\u91cf\u3002<br><br>\u7167\u5ea6\u7684 SI \u5355\u4f4d\u4e3a\u52d2\u514b\u65af\uff08lux\uff09\uff0c\u5373\u6bcf\u5e73\u65b9\u7c73\u7684\u6d41\u660e\u6570\uff08lm\/m\u00b2\uff09\u3002\u5728\u91c7\u7528\u7f8e\u56fd\u60ef\u7528\u5355\u4f4d\u7684\u5730\u533a\uff0c\u82f1\u5c3a\u70db\u5149\uff08foot-candle\uff09 \u4e5f\u662f\u4e00\u79cd\u5e38\u7528\u7684\u7167\u5ea6\u5355\u4f4d\uff0c\u5b9a\u4e49\u4e3a\u6bcf\u5e73\u65b9\u82f1\u5c3a\u4e00\u6d41\u660e\uff0c\u7ea6\u7b49\u4e8e 10.764 lux\u3002<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>\u4ec0\u4e48\u662f\u76f8\u5173\u8272\u6e29\uff08CCT\uff0cCorrelated Color Temperature\uff09\uff1f<\/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>\u76f8\u5173\u8272\u6e29\uff08CCT\uff09 \u7528\u4e8e\u63cf\u8ff0\u5149\u6e90\u7684\u989c\u8272\u5916\u89c2\uff0c\u5176\u5b9a\u4e49\u57fa\u4e8e\u4e00\u4e2a\u7406\u60f3\u9ed1\u4f53\u8f90\u5c04\u4f53\u5728\u67d0\u4e00\u6e29\u5ea6\uff08\u4ee5\u5f00\u5c14\u6587 Kelvin \u4e3a\u5355\u4f4d\uff09\u4e0b\u6240\u53d1\u51fa\u7684\u76f8\u4f3c\u8272\u8c03\u3002\n\u7b80\u5355\u6765\u8bf4\uff0cCCT \u7528\u6765\u5224\u65ad\u5149\u6e90\u770b\u8d77\u6765\u662f\u504f\u6696\uff08\u9ec4\u8272\uff0f\u7ea2\u8272\u8c03\uff09\u8fd8\u662f\u504f\u51b7\uff08\u84dd\u8272\u8c03\uff09\uff0c\u5e76\u4ee5\u5176\u8272\u6e29\u6570\u503c\u4f5c\u4e3a\u4f9d\u636e\u3002<br><br>\u56fd\u9645\u5355\u4f4d\u5236\uff08SI\uff09\u4e2d\u7684\u6e29\u5ea6\u5355\u4f4d\u4e3a\u5f00\u5c14\u6587\uff08K\uff09\u3002<\/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 \u6e29\u6696\u8212\u9002\uff082200K\u20132700K\uff09\uff1a\u8425\u9020\u653e\u677e\u3001\u6e29\u99a8\u4e14\u5177\u6709\u5438\u5f15\u529b\u7684\u6c1b\u56f4\u3002\u9002\u5408\u7528\u4e8e\u4f4f\u5b85\u7a7a\u95f4\u3001\u5367\u5ba4\u548c\u9910\u996e\u7a7a\u95f4\u3002<\/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 \u4e2d\u6027\u767d\u5149\uff083000K\u20133500K\uff09\uff1a\u5149\u7ebf\u5747\u8861\uff0c\u9002\u7528\u4e8e\u529e\u516c\u5ba4\u3001\u53a8\u623f\u548c\u96f6\u552e\u7a7a\u95f4\u7b49\u4e00\u822c\u7167\u660e\u9700\u6c42\u3002<\/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 \u51b7\u767d\u5149\uff084000K\u20134500K\uff09\uff1a\u5149\u7ebf\u6e05\u6670\u3001\u96c6\u4e2d\uff0c\u9002\u5408\u7528\u4e8e\u5de5\u4f5c\u4efb\u52a1\u3001\u5de5\u4f5c\u7ad9\u548c\u8f66\u5e93\u7b49\u7a7a\u95f4\u3002<\/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 \u65e5\u5149\uff0f\u6237\u5916\u5149\uff085000K\u20136500K\uff09\uff1a\u6a21\u62df\u81ea\u7136\u65e5\u5149\uff1b\u975e\u5e38\u9002\u5408\u7528\u4e8e\u6237\u5916\u7167\u660e\u3001\u505c\u8f66\u573a\u548c\u8fd0\u52a8\u8bbe\u65bd\u3002<\/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>\u4ec0\u4e48\u662f CRI\uff08\u663e\u8272\u6307\u6570\uff09\uff1f<\/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>\u663e\u8272\u6307\u6570\uff08CRI\uff09 \u7528\u4e8e\u91cf\u5316\u5149\u6e90\u76f8\u5bf9\u4e8e\u53c2\u8003\u5149\u6e90\uff08\u5982\u81ea\u7136\u65e5\u5149\uff09\u5448\u73b0\u7269\u4f53\u771f\u5b9e\u989c\u8272\u7684\u51c6\u786e\u7a0b\u5ea6\u3002\nCRI \u7684\u6570\u503c\u7531\u5149\u6e90\u7684\u5149\u8c31\u7279\u6027\u51b3\u5b9a\u3002<\/p>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-1853f3af8a47a782c268ce09300d8a9b\" style=\"font-size:15px\"><br>\u8be5\u6307\u6570\u7684\u6d4b\u91cf\u8303\u56f4\u4e3a 0 \u81f3 100\uff0c\u5176\u4e2d 100 \u8868\u793a\u5728\u8be5\u5149\u6e90\u4e0b\u7269\u4f53\u7684\u989c\u8272\u4e0e\u5728\u81ea\u7136\u65e5\u5149\u4e0b\u5448\u73b0\u7684\u6548\u679c\u5b8c\u5168\u4e00\u81f4\u3002\n\u901a\u5e38\uff0cCRI \u5728 80 \u81f3 90 \u4e4b\u95f4 \u7684\u5149\u6e90\u88ab\u8ba4\u4e3a\u662f\u826f\u597d\u7684\uff0c\u800c CRI \u8fbe\u5230 90 \u4ee5\u4e0a \u5219\u88ab\u89c6\u4e3a\u5177\u6709\u5353\u8d8a\u7684\u663e\u8272\u6027\u80fd\u3002<\/p>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-d66a4871bbb1d4815e7d5e7617820135\" style=\"font-size:15px\"><br>\u4e00\u822c\u539f\u5219\uff1a <em><strong>CRI \u8d8a\u9ad8\uff0c\u5149\u6e90\u7684\u663e\u8272\u80fd\u529b\u8d8a\u597d\u3002<\/strong><\/em>.<br><br>\u6700\u5e38\u7528\u7684 CRI \u6307\u6807\u662f CIE Ra\u3002\n\u663e\u8272\u6307\u6570 Ra\uff08\u4e00\u822c\u53c2\u8003\u663e\u8272\u6307\u6570\uff09 \u662f\u7531\u524d\u516b\u4e2a\u6d4b\u8bd5\u8272\u6837\uff08R1\u2013R8\uff09\u7684\u5e73\u5747\u503c\u8ba1\u7b97\u5f97\u51fa\u3002\n\n\u6839\u636e EN 12464-1 \u7167\u660e\u6807\u51c6\uff0c\u5927\u591a\u6570\u6d3b\u52a8\u8981\u6c42\u7684\u6700\u4f4e Ra \u503c\u4e3a \u2265 80\u3002\n\n\u5176\u4ed6\u6d4b\u8bd5\u8272\u6837\uff08R9\u2013R15\uff09\u4e0d\u5305\u542b\u5728 Ra \u7684\u8ba1\u7b97\u4e2d\uff0c\u5176\u4e2d\u5305\u62ec\uff1aR9\uff1a\u9ad8\u9971\u548c\u7ea2\u8272,  R13\uff1a\u80a4\u8272\uff08\u6d45\u8272\uff09, R15\uff1a\u80a4\u8272\uff08\u4e2d\u7b49\uff09\n\n\u8fd9\u610f\u5473\u7740\uff0c\u5373\u4f7f\u67d0\u4e9b\u5149\u6e90\u5177\u6709\u8f83\u9ad8\u7684 CRI\uff08Ra\uff09\u6570\u503c\uff0c\u5728\u7ea2\u8272\u5448\u73b0\u65b9\u9762\u4ecd\u53ef\u80fd\u8868\u73b0\u4e0d\u4f73\u3002\n\u56e0\u6b64\uff0c\u7167\u660e\u4e13\u4e1a\u4eba\u58eb\u901a\u5e38\u4f1a\u5728\u8bc4\u4f30 CRI \u7684\u540c\u65f6\uff0c\u7279\u522b\u5173\u6ce8 R9 \u6570\u503c\u3002<br><br>\u5168\u90e8 15 \u4e2a\u6d4b\u8bd5\u8272\u6837\u7684\u5e73\u5747\u503c \u4ee5 Re\uff08\u6269\u5c55\u53c2\u8003\u663e\u8272\u6307\u6570\uff09 \u8868\u793a\uff0c\u53ef\u7528\u4e8e\u66f4\u7cbe\u786e\u5730\u8bc4\u4f30\u5149\u54c1\u8d28\u3002<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=\"zh_CN\" \/>\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\/zh_cn\/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=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data1\" content=\"2 \u5206\" \/>\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\":\"zh-Hans\",\"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\":\"zh-Hans\"}]}<\/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":"zh_CN","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\/zh_cn\/illuminance-cct-and-cri\/","article_modified_time":"2026-01-21T08:17:43+00:00","twitter_card":"summary_large_image","twitter_misc":{"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4":"2 \u5206"},"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":"zh-Hans","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":"zh-Hans"}]}},"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/lightingrecipe.com\/zh_cn\/wp-json\/wp\/v2\/pages\/2607","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lightingrecipe.com\/zh_cn\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/lightingrecipe.com\/zh_cn\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/lightingrecipe.com\/zh_cn\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/lightingrecipe.com\/zh_cn\/wp-json\/wp\/v2\/comments?post=2607"}],"version-history":[{"count":3,"href":"https:\/\/lightingrecipe.com\/zh_cn\/wp-json\/wp\/v2\/pages\/2607\/revisions"}],"predecessor-version":[{"id":2688,"href":"https:\/\/lightingrecipe.com\/zh_cn\/wp-json\/wp\/v2\/pages\/2607\/revisions\/2688"}],"wp:attachment":[{"href":"https:\/\/lightingrecipe.com\/zh_cn\/wp-json\/wp\/v2\/media?parent=2607"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}