{"id":8352,"date":"2025-05-19T08:58:41","date_gmt":"2025-05-19T06:58:41","guid":{"rendered":"https:\/\/malux.com\/kunskapsbankinlagg\/what-is-the-color-rendering-index\/"},"modified":"2026-02-23T09:24:44","modified_gmt":"2026-02-23T08:24:44","slug":"what-is-the-color-rendering-index","status":"publish","type":"kunskapsbankinlagg","link":"https:\/\/www.malux.com\/en\/kunskapsbankinlagg\/what-is-the-color-rendering-index\/","title":{"rendered":"What is the Color Rendering Index?"},"content":{"rendered":"\n<div class=\"wp-block-stackable-columns stk-block-columns stk-block stk-fd61b6e stk-block-background\" data-block-id=\"fd61b6e\"><style>.stk-fd61b6e {background-color:#ffdc2e !important;padding-top:80px !important;padding-bottom:80px !important;margin-bottom:0px !important;}.stk-fd61b6e:before{background-color:#ffdc2e !important;}@media screen and (max-width: 767px){.stk-fd61b6e {padding-top:60px !important;padding-bottom:60px !important;}}<\/style><div class=\"stk-row stk-inner-blocks stk-block-content stk-content-align stk-fd61b6e-column\">\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-50e28e9\" data-v=\"4\" data-block-id=\"50e28e9\"><style>.stk-50e28e9 {max-width:1024px !important;min-width:auto !important;margin-right:auto !important;margin-left:auto !important;}@media screen and (max-width: 1023px){.stk-50e28e9 {max-width:90% !important;min-width:auto !important;}}<\/style><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-50e28e9-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-50e28e9-inner-blocks\">\n<div class=\"wp-block-stackable-columns stk-block-columns stk-block stk-00ee3e6\" data-block-id=\"00ee3e6\"><style>.stk-00ee3e6 {margin-bottom:30px !important;}.stk-00ee3e6-column{--stk-columns-spacing:0px !important;--stk-column-gap:60px !important;}@media screen and (max-width: 767px){.stk-00ee3e6 {margin-bottom:0px !important;--stk-col-order-1:2 !important;--stk-col-order-2:1 !important;}}<\/style><div class=\"stk-row stk-inner-blocks stk-block-content stk-content-align stk-00ee3e6-column\">\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-6b15296\" data-v=\"4\" data-block-id=\"6b15296\"><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-6b15296-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-6b15296-inner-blocks\">\n<div class=\"wp-block-stackable-text stk-block-text stk-block stk-59c5467\" id=\"corem-lam-solorro-in-nus-nostempo\" data-block-id=\"59c5467\"><style>@media screen and (max-width: 1023px){.stk-59c5467 {margin-bottom:30px !important;}}<\/style><p class=\"stk-block-text__text\">Do you find it difficult to distinguish your black and blue socks from each other? This may be because the nearest light source has a low CRI. Several factors must be considered when choosing the optimal lighting system for a specific space. Color rendering is one of these factors.   <br\/><br\/>It should be noted that all light sources exhibit a specific light spectrum.<\/p><\/div>\n<\/div><\/div><\/div>\n\n\n\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-2c5869a\" data-v=\"4\" data-block-id=\"2c5869a\"><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-2c5869a-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-2c5869a-inner-blocks\">\n<div class=\"wp-block-stackable-text stk-block-text stk-block stk-4fe6fda\" data-block-id=\"4fe6fda\"><p class=\"stk-block-text__text\">Color rendering refers to how well light sources reproduce colors and is measured on a scale from 0 to 100. This index indicates how accurate the light source&#8217;s color is in relation to sunlight. The higher the CRI, the closer the light source is to natural light. Daylight has a CRI of 100.   <br\/><br\/>The colors we perceive are based on this spectrum.<\/p><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n<div class=\"wp-block-stackable-columns stk-block-columns stk-block stk-2ef092c\" data-block-id=\"2ef092c\"><style>.stk-2ef092c {margin-bottom:0px !important;}<\/style><div class=\"stk-row stk-inner-blocks stk-block-content stk-content-align stk-2ef092c-column\">\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-8ab4b8e\" data-v=\"4\" data-block-id=\"8ab4b8e\"><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-8ab4b8e-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-8ab4b8e-inner-blocks\">\n<div class=\"wp-block-stackable-image stk-block-image stk-block stk-5014f1e\" data-block-id=\"5014f1e\"><figure><span class=\"stk-img-wrapper stk-image--shape-stretch\"><img loading=\"lazy\" decoding=\"async\" class=\"stk-img wp-image-2421\" src=\"https:\/\/www.malux.com\/wp-content\/uploads\/2025\/05\/jordgubbar_90041adf.jpg\" width=\"1000\" height=\"376\" alt=\"jordgubbar_90041adf\" srcset=\"https:\/\/www.malux.com\/wp-content\/uploads\/2025\/05\/jordgubbar_90041adf.jpg 1000w, https:\/\/www.malux.com\/wp-content\/uploads\/2025\/05\/jordgubbar_90041adf-300x113.jpg 300w, https:\/\/www.malux.com\/wp-content\/uploads\/2025\/05\/jordgubbar_90041adf-768x289.jpg 768w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/span><\/figure><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n<div class=\"wp-block-stackable-columns stk-block-columns stk-block stk-2b36017 stk-block-background\" data-block-id=\"2b36017\"><style>.stk-2b36017 {background-color:#f5f5f5 !important;padding-top:80px !important;padding-bottom:80px !important;margin-bottom:0px !important;}.stk-2b36017:before{background-color:#f5f5f5 !important;}@media screen and (max-width: 767px){.stk-2b36017 {padding-top:60px !important;padding-bottom:60px !important;}}<\/style><div class=\"stk-row stk-inner-blocks stk-block-content stk-content-align stk-2b36017-column\">\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-9377844\" data-v=\"4\" data-block-id=\"9377844\"><style>.stk-9377844 {max-width:1024px !important;min-width:auto !important;margin-right:auto !important;margin-left:auto !important;}@media screen and (max-width: 1023px){.stk-9377844 {max-width:90% !important;min-width:auto !important;}}<\/style><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-9377844-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-9377844-inner-blocks\">\n<div class=\"wp-block-stackable-columns stk-block-columns stk-block stk-9c67b40\" data-block-id=\"9c67b40\"><style>.stk-9c67b40 {margin-bottom:30px !important;}.stk-9c67b40-column{--stk-columns-spacing:0px !important;--stk-column-gap:60px !important;}@media screen and (max-width: 767px){.stk-9c67b40 {margin-bottom:0px !important;--stk-col-order-1:2 !important;--stk-col-order-2:1 !important;}}<\/style><div class=\"stk-row stk-inner-blocks stk-block-content stk-content-align stk-9c67b40-column\">\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-86804d0\" data-v=\"4\" data-block-id=\"86804d0\"><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-86804d0-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-86804d0-inner-blocks\">\n<div class=\"wp-block-stackable-heading stk-block-heading stk-block-heading--v2 stk-block stk-011711c\" id=\"cri-mellan-0-och-70\" data-block-id=\"011711c\"><style>.stk-011711c {margin-bottom:10px !important;}<\/style><h3 class=\"stk-block-heading__text\">CRI between 0 and 70<\/h3><\/div>\n\n\n\n<div class=\"wp-block-stackable-text stk-block-text stk-block stk-9f8f00a\" id=\"corem-lam-solorro-in-nus-nostempo\" data-block-id=\"9f8f00a\"><style>@media screen and (max-width: 1023px){.stk-9f8f00a {margin-bottom:30px !important;}}<\/style><p class=\"stk-block-text__text\">Light sources with a color rendering index below 70 alter our perception of color. Light sources in this index category include: <br\/><br\/>&#8211; Fluorescent tubes<br\/>&#8211; Low-pressure sodium vapor fixtures<br\/>&#8211; High-pressure lamps (with the exception of white fixtures)<br\/>&#8211; Mercury-based clear fixtures<\/p><\/div>\n<\/div><\/div><\/div>\n\n\n\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-07eb0fa\" data-v=\"4\" data-block-id=\"07eb0fa\"><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-07eb0fa-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-07eb0fa-inner-blocks\">\n<div class=\"wp-block-stackable-heading stk-block-heading stk-block-heading--v2 stk-block stk-821d511\" id=\"cri-mellan-70-och-90\" data-block-id=\"821d511\"><style>.stk-821d511 {margin-bottom:10px !important;}<\/style><h3 class=\"stk-block-heading__text\">CRI between 70 and 90<\/h3><\/div>\n\n\n\n<div class=\"wp-block-stackable-text stk-block-text stk-block stk-2ca7428\" data-block-id=\"2ca7428\"><p class=\"stk-block-text__text\">These light sources display colors satisfactorily. Some of these include: <br\/><br\/>&#8211; Standard LED lamps<br\/>&#8211; Various fluorescent tubes<br\/>&#8211; A number of metal halide fixtures<br\/>&#8211; High-pressure sodium vapor lamps<\/p><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n<div class=\"wp-block-stackable-columns stk-block-columns stk-block stk-7bd7cb5 stk-block-background\" data-block-id=\"7bd7cb5\"><style>.stk-7bd7cb5 {background-color:#f5f5f5 !important;padding-top:80px !important;padding-bottom:80px !important;margin-bottom:0px !important;}.stk-7bd7cb5:before{background-color:#f5f5f5 !important;}@media screen and (max-width: 767px){.stk-7bd7cb5 {padding-top:60px !important;padding-bottom:60px !important;}}<\/style><div class=\"stk-row stk-inner-blocks stk-block-content stk-content-align stk-7bd7cb5-column\">\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-850c9da\" data-v=\"4\" data-block-id=\"850c9da\"><style>.stk-850c9da {max-width:1024px !important;min-width:auto !important;margin-right:auto !important;margin-left:auto !important;}@media screen and (max-width: 1023px){.stk-850c9da {max-width:90% !important;min-width:auto !important;}}<\/style><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-850c9da-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-850c9da-inner-blocks\">\n<div class=\"wp-block-stackable-columns stk-block-columns stk-block stk-376488d\" data-block-id=\"376488d\"><style>.stk-376488d {margin-bottom:30px !important;}.stk-376488d-column{--stk-columns-spacing:0px !important;--stk-column-gap:60px !important;}@media screen and (max-width: 767px){.stk-376488d {margin-bottom:0px !important;--stk-col-order-1:2 !important;--stk-col-order-2:1 !important;}}<\/style><div class=\"stk-row stk-inner-blocks stk-block-content stk-content-align stk-376488d-column\">\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-d33c865\" data-v=\"4\" data-block-id=\"d33c865\"><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-d33c865-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-d33c865-inner-blocks\">\n<div class=\"wp-block-stackable-heading stk-block-heading stk-block-heading--v2 stk-block stk-3be4dbc\" id=\"cri-mellan-90-och-100\" data-block-id=\"3be4dbc\"><style>.stk-3be4dbc {margin-bottom:10px !important;}<\/style><h3 class=\"stk-block-heading__text\">CRI between 90 and 100<\/h3><\/div>\n\n\n\n<div class=\"wp-block-stackable-text stk-block-text stk-block stk-f8a09b0\" id=\"corem-lam-solorro-in-nus-nostempo\" data-block-id=\"f8a09b0\"><style>@media screen and (max-width: 1023px){.stk-f8a09b0 {margin-bottom:30px !important;}}<\/style><p class=\"stk-block-text__text\">&#8211; High-efficiency LED lamps<br\/>&#8211; A number of metal halide fixtures<br\/>&#8211; Incandescent lamps<\/p><\/div>\n<\/div><\/div><\/div>\n\n\n\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-9ae23a7\" data-v=\"4\" data-block-id=\"9ae23a7\"><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-9ae23a7-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-9ae23a7-inner-blocks\"><\/div><\/div><\/div>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n<div class=\"wp-block-stackable-columns stk-block-columns stk-block stk-8ae018e stk-block-background\" data-block-id=\"8ae018e\"><style>.stk-8ae018e {background-color:#f5f5f5 !important;padding-top:80px !important;padding-bottom:80px !important;margin-bottom:0px !important;}.stk-8ae018e:before{background-color:#f5f5f5 !important;}@media screen and (max-width: 767px){.stk-8ae018e {padding-top:60px !important;padding-bottom:60px !important;}}<\/style><div class=\"stk-row stk-inner-blocks stk-block-content stk-content-align stk-8ae018e-column\">\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-1ed598f\" data-v=\"4\" data-block-id=\"1ed598f\"><style>.stk-1ed598f {max-width:1024px !important;min-width:auto !important;margin-right:auto !important;margin-left:auto !important;}@media screen and (max-width: 1023px){.stk-1ed598f {max-width:90% !important;min-width:auto !important;}}<\/style><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-1ed598f-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-1ed598f-inner-blocks\">\n<div class=\"wp-block-stackable-heading stk-block-heading stk-block-heading--v2 stk-block stk-a8601f3\" id=\"hur-valjer-man-ratt-cri-for-sitt-belysningssystem\" data-block-id=\"a8601f3\"><h2 class=\"stk-block-heading__text\">How do you choose the right CRI for your lighting system?<\/h2><\/div>\n\n\n\n<div class=\"wp-block-stackable-columns stk-block-columns stk-block stk-fe8e0cd\" data-block-id=\"fe8e0cd\"><style>.stk-fe8e0cd {margin-bottom:30px !important;}.stk-fe8e0cd-column{--stk-columns-spacing:0px !important;--stk-column-gap:60px !important;}@media screen and (max-width: 767px){.stk-fe8e0cd {margin-bottom:0px !important;--stk-col-order-1:2 !important;--stk-col-order-2:1 !important;}}<\/style><div class=\"stk-row stk-inner-blocks stk-block-content stk-content-align stk-fe8e0cd-column\">\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-d538469\" data-v=\"4\" data-block-id=\"d538469\"><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-d538469-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-d538469-inner-blocks\">\n<div class=\"wp-block-stackable-text stk-block-text stk-block stk-f3d8189\" id=\"corem-lam-solorro-in-nus-nostempo\" data-block-id=\"f3d8189\"><style>@media screen and (max-width: 1023px){.stk-f3d8189 {margin-bottom:30px !important;}}<\/style><p class=\"stk-block-text__text\">It depends on the conditions and the environment in which the lighting will be used.<br\/><br\/>&#8211; For outdoor use, lighting systems with a CRI below 70 can be selected, provided it is not necessary to distinguish colors accurately.<br\/>&#8211; For indoor use, it is always better to choose a lighting system with a CRI higher than 70.<\/p><\/div>\n<\/div><\/div><\/div>\n\n\n\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-1596253\" data-v=\"4\" data-block-id=\"1596253\"><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-1596253-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-1596253-inner-blocks\">\n<div class=\"wp-block-stackable-text stk-block-text stk-block stk-7c94cf5\" id=\"corem-lam-solorro-in-nus-nostempo\" data-block-id=\"7c94cf5\"><style>@media screen and (max-width: 1023px){.stk-7c94cf5 {margin-bottom:30px !important;}}<\/style><p class=\"stk-block-text__text\">A CRI higher than 80 is recommended for environments where precision work is performed, such as in manufacturing industries and shops.<br\/><br\/>&#8211; When a space requires lighting of exceptional quality, such as in art galleries or pharmaceutical manufacturing, it is advantageous to use fixtures that reproduce the color spectrum as faithfully as possible. In these cases, a CRI higher than 90 is required. <\/p><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n<div class=\"wp-block-stackable-columns stk-block-columns stk-block stk-57bac6e\" data-block-id=\"57bac6e\"><div class=\"stk-row stk-inner-blocks stk-block-content stk-content-align stk-57bac6e-column\">\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-dd9fb41\" data-v=\"4\" data-block-id=\"dd9fb41\"><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-dd9fb41-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-dd9fb41-inner-blocks\">\n<div class=\"wp-block-stackable-image stk-block-image stk-block stk-5838815\" data-block-id=\"5838815\"><figure><span class=\"stk-img-wrapper stk-image--shape-stretch\"><img loading=\"lazy\" decoding=\"async\" class=\"stk-img wp-image-2422\" src=\"https:\/\/www.malux.com\/wp-content\/uploads\/2025\/05\/cri-exempel4_6c071d4b.png\" width=\"1000\" height=\"508\" alt=\"jordgubbar_90041adf\" srcset=\"https:\/\/www.malux.com\/wp-content\/uploads\/2025\/05\/cri-exempel4_6c071d4b.png 1000w, https:\/\/www.malux.com\/wp-content\/uploads\/2025\/05\/cri-exempel4_6c071d4b-300x152.png 300w, https:\/\/www.malux.com\/wp-content\/uploads\/2025\/05\/cri-exempel4_6c071d4b-768x390.png 768w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/span><\/figure><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n<div class=\"wp-block-stackable-columns stk-block-columns stk-block stk-ecec45c stk-block-background\" data-block-id=\"ecec45c\"><style>.stk-ecec45c {background-color:#f5f5f5 !important;padding-top:80px !important;padding-bottom:80px !important;margin-bottom:0px !important;}.stk-ecec45c:before{background-color:#f5f5f5 !important;}@media screen and (max-width: 767px){.stk-ecec45c {padding-top:60px !important;padding-bottom:60px !important;}}<\/style><div class=\"stk-row stk-inner-blocks stk-block-content stk-content-align stk-ecec45c-column\">\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-40f18ac\" data-v=\"4\" data-block-id=\"40f18ac\"><style>.stk-40f18ac {max-width:1024px !important;min-width:auto !important;margin-right:auto !important;margin-left:auto !important;}@media screen and (max-width: 1023px){.stk-40f18ac {max-width:90% !important;min-width:auto !important;}}<\/style><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-40f18ac-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-40f18ac-inner-blocks\">\n<div class=\"wp-block-stackable-columns stk-block-columns stk-block stk-9526e04\" data-block-id=\"9526e04\"><style>.stk-9526e04 {margin-bottom:30px !important;}.stk-9526e04-column{--stk-columns-spacing:0px !important;--stk-column-gap:60px !important;}@media screen and (max-width: 767px){.stk-9526e04 {margin-bottom:0px !important;--stk-col-order-1:2 !important;--stk-col-order-2:1 !important;}}<\/style><div class=\"stk-row stk-inner-blocks stk-block-content stk-content-align stk-9526e04-column\">\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-20de38e\" data-v=\"4\" data-block-id=\"20de38e\"><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-20de38e-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-20de38e-inner-blocks\">\n<div class=\"wp-block-stackable-text stk-block-text stk-block stk-b6a183f\" id=\"corem-lam-solorro-in-nus-nostempo\" data-block-id=\"b6a183f\"><style>@media screen and (max-width: 1023px){.stk-b6a183f {margin-bottom:30px !important;}}<\/style><p class=\"stk-block-text__text\">In summary, the color rendering index is a value representing how colors are reproduced in relation to daylight.<\/p><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>The Color Rendering Index or Ra index, abbreviated as CRI, is measured from 0 to 100, where 100 corresponds &#8230;<\/p>\n","protected":false},"featured_media":8353,"template":"","meta":{"_acf_changed":false},"kunskapsbankskategori":[236],"class_list":["post-8352","kunskapsbankinlagg","type-kunskapsbankinlagg","status-publish","has-post-thumbnail","hentry","kunskapsbankskategori-buildings"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What is the Color Rendering Index? - Malux<\/title>\n<meta name=\"description\" content=\"The Color Rendering Index or Ra index, abbreviated as CRI, is measured from 0 to 100, where 100 corresponds to perfect daylight. The...\" \/>\n<meta name=\"robots\" content=\"noindex, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What is the Color Rendering Index? - Malux\" \/>\n<meta property=\"og:description\" content=\"The Color Rendering Index or Ra index, abbreviated as CRI, is measured from 0 to 100, where 100 corresponds to perfect daylight. 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