{"id":2616,"date":"2026-01-13T07:42:19","date_gmt":"2026-01-13T07:42:19","guid":{"rendered":"https:\/\/lightingrecipe.com\/?page_id=2616"},"modified":"2026-01-21T06:53:14","modified_gmt":"2026-01-21T06:53:14","slug":"s-p-ratio-blue-hazard-ranking-eb-and-kbv","status":"publish","type":"page","link":"https:\/\/lightingrecipe.com\/zh_cn\/s-p-ratio-blue-hazard-ranking-eb-and-kbv\/","title":{"rendered":"S\/P \u6bd4\u503c\u3001\u84dd\u5149\u5371\u5bb3\u7b49\u7ea7\u3001Eb \u548c Kbv"},"content":{"rendered":"<div class=\"wp-block-columns alignwide has-primary-color has-text-color has-link-color has-small-font-size wp-elements-d95f567f9031974c1c94d5e8adad5506 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 wp-elements-07ecadd99d5a17227f95c09d9c5686fc\" style=\"font-size:15px\">\u5149\u7ebf\u901a\u8fc7\u89d2\u819c\u8fdb\u5165\u773c\u775b\uff0c\u968f\u540e\u88ab\u805a\u7126\u5230\u89c6\u7f51\u819c\u4e0a\u3002\u89c6\u7f51\u819c\u4e2d\u542b\u6709\u6570\u4ee5\u767e\u4e07\u8ba1\u7684\u5bf9\u5149\u654f\u611f\u7684\u7ec6\u80de\uff0c\u79f0\u4e3a\u611f\u5149\u53d7\u4f53\uff08photoreceptors\uff09\uff0c\u4e3b\u8981\u5206\u4e3a\u4e24\u79cd\u7c7b\u578b\uff1a\u89c6\u6746\u7ec6\u80de\u548c\u89c6\u9525\u7ec6\u80de\u3002<br><br><strong>\u6697\u89c6\u89c9<\/strong><br><br>\u6697\u89c6\u89c9\u662f\u6307\u5728\u4f4e\u7167\u5ea6\u73af\u5883\u4e0b\u7684\u89c6\u89c9\u72b6\u6001\uff0c\u4f8b\u5982\u591c\u95f4\u3002\u5728\u8fd9\u79cd\u5f31\u5149\u73af\u5883\u4e2d\uff0c\u773c\u775b\u4e3b\u8981\u4f9d\u8d56\u89c6\u6746\u7ec6\u80de\u5de5\u4f5c\uff1b\u89c6\u6746\u7ec6\u80de\u5bf9\u5149\u975e\u5e38\u654f\u611f\uff0c\u4f46\u65e0\u6cd5\u5206\u8fa8\u989c\u8272\u6216\u7ec6\u5fae\u7ec6\u8282\u3002\u6697\u89c6\u89c9\u5bf9\u84dd\u8272\u6700\u4e3a\u654f\u611f\uff0c\u4f46\u6574\u4f53\u8272\u5f69\u5206\u8fa8\u80fd\u529b\u975e\u5e38\u6709\u9650\u3002\u89c6\u6746\u7ec6\u80de\u901a\u5e38\u5728\u4eae\u5ea6\u4f4e\u4e8e\u7ea6 0.005 lux \u65f6\u53d1\u6325\u4f5c\u7528\u3002<br><br><strong>\u660e\u89c6\u89c9<\/strong><br><br>\u660e\u89c6\u89c9\u662f\u6307\u5728\u9ad8\u7167\u5ea6\u6761\u4ef6\u4e0b\u7684\u89c6\u89c9\u72b6\u6001\uff0c\u4f8b\u5982\u65e5\u5149\u6216\u4eba\u5de5\u7167\u660e\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u773c\u775b\u4e3b\u8981\u4f9d\u8d56\u89c6\u9525\u7ec6\u80de\u5de5\u4f5c\uff0c\u89c6\u9525\u7ec6\u80de\u8d1f\u8d23\u989c\u8272\u611f\u77e5\u548c\u89c6\u89c9\u6e05\u6670\u5ea6\u3002\u660e\u89c6\u89c9\u5177\u6709\u51fa\u8272\u7684\u8272\u5f69\u5206\u8fa8\u80fd\u529b\u3002\u89c6\u9525\u7ec6\u80de\u901a\u5e38\u5728\u4eae\u5ea6\u9ad8\u4e8e\u7ea6 5.0 lux \u65f6\u53d1\u6325\u6700\u4f73\u4f5c\u7528\u3002<br><br><strong>\u4e2d\u95f4\u89c6\u89c9\uff08\u4ea6\u79f0\uff1a\u4e2d\u95f4\u4eae\u5ea6\u89c6\u89c9\uff09<\/strong><br><br>\u6211\u4eec\u901a\u5e38\u6240\u8ba4\u4e3a\u7684\u201c\u6b63\u5e38\u201d\u89c6\u89c9\uff0c\u5b9e\u9645\u4e0a\u662f\u6697\u89c6\u89c9\u4e0e\u660e\u89c6\u89c9\u7684\u7ed3\u5408\u3002\u8fd9\u4e00\u91cd\u53e0\u533a\u57df\u88ab\u79f0\u4e3a\u4e2d\u95f4\u89c6\u89c9\u8303\u56f4\uff08mesopic range\uff09\uff0c\u5728\u8be5\u8303\u56f4\u5185\uff0c\u89c6\u6746\u7ec6\u80de\u548c\u89c6\u9525\u7ec6\u80de\u5171\u540c\u53c2\u4e0e\u89c6\u89c9\u611f\u77e5\u3002<\/p>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color has-medium-font-size wp-elements-ed950e3ff655b91ea78743f13eb353bd\"><br><br><strong><em>\u4ec0\u4e48\u662f S\/P \u6bd4\u503c\uff1f<\/em><\/strong><\/p>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-9fe2028abebaf29f295dc05b55b8792b\" style=\"font-size:15px\">S\/P \u6bd4\u503c\u5728\u6697\u89c6\u89c9\u6761\u4ef6\u4e0b\u5c24\u4e3a\u91cd\u8981\uff0c\u56e0\u4e3a\u6b64\u65f6\u89c6\u6746\u7ec6\u80de\u4e3b\u5bfc\u89c6\u89c9\u611f\u77e5\u3002S\/P \u6bd4\u503c\u662f\u4e00\u4e2a\u4e58\u6570\uff0c\u7528\u4e8e\u8868\u793a\u5149\u6e90\u6240\u53d1\u51fa\u7684\u5149\u4e2d\uff0c\u6709\u591a\u5c11\u6bd4\u4f8b\u5bf9\u4eba\u7c7b\u89c6\u89c9\u662f\u6709\u6548\u7684\uff0c\u8fd9\u88ab\u79f0\u4e3a\u89c6\u89c9\u6709\u6548\u6d41\u660e\uff08VELs\uff09\u3002\u5efa\u8bae\u7684 S\/P \u6bd4\u503c\u8303\u56f4\u4e3a 1.8 \u81f3 2.0\u3002<br><br>\u4e00\u822c\u6765\u8bf4\uff0c\u767d\u5149\u5149\u6e90\u5177\u6709\u8f83\u9ad8\u7684 S\/P \u6bd4\u503c\uff0c\u800c\u9ec4\u8272\u6216\u6a59\u8272\u5149\u6e90\u901a\u5e38\u5177\u6709\u8f83\u4f4e\u7684 S\/P \u6bd4\u503c\u3002<\/p>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color has-medium-font-size wp-elements-19dd7e50a84b902cb09434a26114cbe0\"><br><br><strong><em>\u4ec0\u4e48\u662f\u84dd\u5149\u5371\u5bb3\u7b49\u7ea7\uff08Blue Hazard Ranking\uff09\uff1f<\/em><\/strong><\/p>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-a5cbc50d610259ed1dbcc443e12d50a8\" style=\"font-size:15px\">\u84dd\u5149\u5371\u5bb3\u7b49\u7ea7\u7528\u4e8e\u8861\u91cf\u5149\u6e90\u5bf9\u773c\u775b\u5b89\u5168\u6784\u6210\u7684\u98ce\u9669\uff0c\u5c24\u5176\u4e0e\u84dd\u5149\u6ce2\u6bb5\u7684\u66b4\u9732\u76f8\u5173\u3002<br><br>\u84dd\u5149\u662f\u4e00\u79cd\u9ad8\u80fd\u91cf\u53ef\u89c1\u5149\uff08HEV\uff09\uff0c\u6307\u53ef\u89c1\u5149\u5149\u8c31\u4e2d\u7684\u84dd\u8272\u90e8\u5206\u3002\u5176\u6f5c\u5728\u6709\u5bb3\u5f71\u54cd\u4e3b\u8981\u96c6\u4e2d\u5728 380 nm \u81f3 450 nm \u6ce2\u957f\u8303\u56f4\u5185\uff1b\u800c 450 nm \u81f3 500 nm \u7684\u84dd\u5149\u5219\u5177\u6709\u4e00\u5b9a\u76ca\u5904\u3002\u9002\u91cf\u7684\u84dd\u5149\u6709\u52a9\u4e8e\u63d0\u5347\u6574\u4f53\u5065\u5eb7\u4e0e\u6d3b\u529b\u3002\u7136\u800c\uff0c\u8fc7\u91cf\u7684\u84dd\u5149\u66b4\u9732\u53ef\u80fd\u5bfc\u81f4\u89c6\u7f51\u819c\u7ec6\u80de\u4ea7\u751f\u6c27\u5316\u5e94\u6fc0\uff0c\u4ece\u800c\u5f15\u53d1\u4e0d\u53ef\u9006\u7684\u5149\u5316\u5b66\u635f\u4f24\uff0c\u5e76\u52a0\u91cd\u9ec4\u6591\u533a\u7684\u7ec6\u80de\u635f\u4f24\u3002\u8fd9\u79cd\u73b0\u8c61\u901a\u5e38\u88ab\u79f0\u4e3a\u201c\u84dd\u5149\u5371\u5bb3\u201d\u3002<br><br>IEC 62471 \u6807\u51c6\u89c4\u5b9a\u4e86\u8bc4\u4f30\u5149\u6e90\u548c\u706f\u5177\u84dd\u5149\u98ce\u9669\u7684\u65b9\u6cd5\u3002\u6839\u636e\u8be5\u6807\u51c6\uff0c\u4ea7\u54c1\u53ef\u5212\u5206\u4e3a\u4ee5\u4e0b\u98ce\u9669\u7b49\u7ea7\uff1a<\/p>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-7c43a6309c52fd5bdd157f2532880851\" style=\"font-size:15px\">\ud83d\udd39<strong>RG0<\/strong>\uff1a\u65e0\u98ce\u9669<\/p>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-9b9d56b412a82838e9afcfacbd212fed\" style=\"font-size:15px\">\ud83d\udd39<strong>RG1<\/strong>\uff1a\u4f4e\u98ce\u9669<\/p>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-4987f09f1dfe7e51d5a273260ded8c0f\" style=\"font-size:15px\">\ud83d\udd39<strong>RG2<\/strong>\uff1a\u4e2d\u5ea6\u98ce\u9669\uff0c\u9700\u8981\u6807\u793a\u8b66\u544a\u6807\u7b7e<\/p>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-d8204ca908a6e3fb5ae5dffa521c2de3\" style=\"font-size:15px\">\ud83d\udd39<strong>RG3<\/strong>\uff1a\u9ad8\u98ce\u9669\u2014\u2014\u5373\u4f7f\u77ed\u65f6\u95f4\u66b4\u9732\u4e8e\u8be5\u5149\u6e90\u4e5f\u53ef\u80fd\u9020\u6210\u635f\u5bb3\u3002\u6b64\u7c7b\u706f\u5177\u901a\u5e38\u4e0d\u88ab\u5141\u8bb8\u4f7f\u7528\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-63a56930878c5fdf9c77dbc512da099b\"><strong><em>\u4ec0\u4e48\u662f Eb\uff08\u84dd\u5149\u5371\u5bb3\u52a0\u6743\u8f90\u7167\u5ea6\uff09\uff1f<\/em><\/strong><\/p>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-951ffba887cfa2e98578b766d7b97de5\" style=\"font-size:15px\">Eb \u6307\u7531\u5c0f\u578b\u5149\u6e90\uff08\u5982 LED\uff09\u53d1\u5c04\u7684\u84dd\u5149\u8f90\u7167\u5ea6\uff0c\u5176\u8ba1\u91cf\u5355\u4f4d\u4e3a\u74e6\u7279\u6bcf\u5e73\u65b9\u7c73\uff08W\/m\u00b2\uff09\u3002<br><br>\u84dd\u5149\u8f90\u7167\u5ea6\uff08Eb\uff09 \u7528\u4e8e\u8ba1\u7b97\u6700\u5927\u5141\u8bb8\u66b4\u9732\u65f6\u95f4\uff0c\u5e76\u7528\u4e8e\u786e\u5b9a\u4ea7\u54c1\u6240\u5c5e\u7684\u98ce\u9669\u7b49\u7ea7\uff08Risk Group\uff09\u3002\u8be5\u5206\u7c7b\u4e0e\u89c6\u7f51\u819c\u4e0a\u7684\u6709\u6548\u8f90\u7167\u5ea6\u6210\u6b63\u6bd4\u3002<br>RG1 \u84dd\u5149\u8f90\u7167\u5ea6\u4e0a\u9650\u4e3a 1 W\/m\u00b2\uff0c\u8be5\u6570\u503c\u662f\u4ece\u98ce\u9669\u7b49\u7ea7 1\uff08RG1\uff09 \u8fc7\u6e21\u5230 \u98ce\u9669\u7b49\u7ea7 2\uff08RG2\uff09 \u7684\u4e34\u754c\u9608\u503c\u3002<\/p>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color has-medium-font-size wp-elements-369c04afe8fcf942ce64d052ddf0b89c\"><br><br><strong><em>\u4ec0\u4e48\u662f Kbv\uff08\u84dd\u5149\u5371\u5bb3\u8f90\u5c04\u7cfb\u6570\uff09\uff1f<\/em><\/strong><\/p>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-b9e72512ef8b95deb40c3fec1463c7f1\" style=\"font-size:15px\">Kbv \u662f\u5728 IEC\/TR 62778:2014\u300aIEC 62471 \u5728\u5149\u6e90\u548c\u706f\u5177\u84dd\u5149\u5371\u5bb3\u8bc4\u4f30\u4e2d\u7684\u5e94\u7528\u300b\u4e2d\u5f15\u5165\u7684\u4e00\u9879\u6307\u6807\u3002IEC 62778 \u4e3a\u4e3b\u8981\u5728\u53ef\u89c1\u5149\u5149\u8c31\uff08380 nm\u2013780 nm\uff09\u8303\u56f4\u5185\u53d1\u5149\u7684\u7167\u660e\u4ea7\u54c1\u8fdb\u884c\u84dd\u5149\u5371\u5bb3\u8bc4\u4f30\u63d0\u4f9b\u4e86\u8bf4\u660e\u548c\u6307\u5bfc\u3002<br><br>Kbv \u7684\u8ba1\u7b97\u65b9\u5f0f\u4e3a Eb \u9664\u4ee5\u7167\u5ea6\uff08\u4ee5 lux \u4e3a\u5355\u4f4d\uff09\u3002\u5b83\u672c\u8d28\u4e0a\u8868\u793a\u6bcf\u5355\u4f4d\u53ef\u89c1\u5149\u80fd\u91cf\u6240\u5bf9\u5e94\u7684\u84dd\u5149\u5371\u5bb3\u6f5c\u529b\u6bd4\u4f8b\u3002\u8fd9\u4e9b\u6307\u6807\u6709\u52a9\u4e8e\u91cf\u5316\u84dd\u5149\u5bf9\u4eba\u4f53\uff0c\u5c24\u5176\u662f\u89c6\u7f51\u819c\u53ef\u80fd\u9020\u6210\u7684\u6f5c\u5728\u5371\u5bb3\u3002<br><br>Eb \u548c Kbv \u88ab\u7814\u7a76\u4eba\u5458\u7528\u4e8e\u8bc4\u4f30\u53ef\u80fd\u6784\u6210\u5149\u751f\u7269\u5371\u5bb3\u7684\u84dd\u5149\u5149\u5ea6\u91cf\u3002\u8fd9\u4e24\u9879\u6307\u6807\u6784\u6210\u5224\u5b9a\u4ea7\u54c1**\u201c\u98ce\u9669\u7b49\u7ea7\uff08Risk Group\uff09\u201d\u5206\u7c7b\u7684\u57fa\u7840\u3002\u7b80\u800c\u8a00\u4e4b\uff0cEb \u548c Kbv \u662f\u7528\u4e8e\u91cf\u5316\u548c\u7406\u89e3\u84dd\u5149\u8f90\u5c04\u76f8\u5173\u5371\u5bb3**\u7684\u6280\u672f\u5de5\u5177\uff0c\u5c24\u5176\u9002\u7528\u4e8e\u5404\u7c7b\u5149\u6e90\uff0c\u4ece\u800c\u6709\u52a9\u4e8e\u5b9e\u65bd\u9002\u5f53\u7684\u5b89\u5168\u63aa\u65bd\u4ee5\u964d\u4f4e\u6f5c\u5728\u98ce\u9669\u3002<\/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\/08\/Lighting-Fundamentals-Part-5.mp4\"><\/video><\/figure>","protected":false},"excerpt":{"rendered":"<p>Light enters the eyes through the cornea, where it is then focused onto the retina. The retina contains millions of light-sensitive cells called photoreceptors, which are divided into two types: rods and cones. Scotopic Vision Scotopic vision refers to vision in dim lighting conditions, such as at night. In these low-light environments, the eyes primarily rely on rod cells, which are highly sensitive to light but do not detect color or fine detail. Scotopic vision is most sensitive to the color blue, but it has a very limited ability to distinguish colors overall. Rods function effectively at luminance levels below approximately 0.005 lux. Photopic Vision Photopic vision occurs under bright light conditions, such as daylight or artificial lighting. In these situations, the eyes rely on cone cells, which are responsible for color perception and visual acuity. Photopic vision provides excellent color discrimination. Cones function best at luminance levels above approximately 5.0 lux. Mesopic Vision What we typically consider \u201cnormal\u201d vision is actually a combination of scotopic and photopic vision. This overlapping region is known as the mesopic range, where both rods and cones contribute to visual perception. What is S\/P Ratio? The S\/P ratio is particularly important under scotopic conditions, where rod cells dominate visual perception. The S\/P ratio is a multiplier that indicates how much of the emitted light is effective for human vision. These are referred to as visually effective lumens (VELs). A recommended S\/P ratio falls between 1.8 and 2.0. Generally, white light sources have high S\/P ratios, while yellow or orange light sources tend to have low S\/P ratios. What is Blue Hazard Ranking? The Blue Hazard Ranking measures the risk that a light source poses to eye safety, particularly in relation to exposure to blue wavelengths. Blue light is a type of high-energy visible (HEV) light, which refers to the blue portion of the visible light spectrum. Its potentially harmful effects are mainly concentrated in the 380 nm to 450 nm range. Blue light in the 450 nm to 500 nm range can offer certain benefits. In moderate amounts, blue light contributes to overall well-being and vitality. However, excessive blue light exposure can cause oxidative stress in retinal cells, leading to irreversible photochemical damage and worsening of cell injury in the macula. This is commonly referred to as the \u201cblue light hazard.\u201d The IEC 62471 standard defines the method for assessing the blue light risk from light sources and luminaires. Based on this standard, products can be classified into the following risk groups: \ud83d\udd39RG0: No risk \ud83d\udd39RG1: Low risk \ud83d\udd39RG2: Moderate risk, requiring warning labels \ud83d\udd39RG3: High risk \u2014 even brief exposure to the light source can cause damage. Luminaires in this category are generally not permitted. What is Eb (Blue Light Hazard Weighted Irradiance)? Eb refers to the irradiance of blue light emitted from a small light source, such as an LED. It is measured in watts per square meter (W\/m\u00b2). Blue light irradiance (Eb) is used to calculate the maximum exposure time and to determine classification into Risk Groups. This classification is proportional to the effective irradiance at the retina.The RG1 blue light irradiance limit is 1 W\/m\u00b2\u2014this is the threshold at which the transition from Risk Group 1 (RG1) to Risk Group 2 (RG2) occurs. What is Kbv (Blue Light Hazard Radiation Coefficient)? Kbv is a metric introduced in the IEC\/TR 62778:2014 standard, Application of IEC 62471 for the Assessment of Blue Light Hazard to Light Sources and Luminaires. IEC 62778 provides clarification and guidance for assessing the blue light hazard of lighting products that primarily emit in the visible spectrum (380 nm to 780 nm). Kbv is calculated as Eb divided by the illuminance (in lux). It essentially represents the ratio of blue light hazard potential per unit of luminous energy. These metrics help quantify the potential harm of blue light, particularly to the retina. Eb and Kbv are used by researchers to assess the photometric quantities of blue light that may pose a photobiological hazard. They form the basis for determining a product\u2019s \u201cRisk Group\u201d classification. In essence, Eb and Kbv are technical tools used to quantify and understand the hazards associated with blue light emissions, particularly from various light sources, thereby aiding in the implementation of appropriate safety measures to reduce potential risks.<\/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-2616","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>S\/P Ratio, Blue Hazard Ranking, Eb and Kbv -<\/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=\"S\/P Ratio, Blue Hazard Ranking, Eb and Kbv -\" \/>\n<meta property=\"og:description\" content=\"Light enters the eyes through the cornea, where it is then focused onto the retina. The retina contains millions of light-sensitive cells called photoreceptors, which are divided into two types: rods and cones. Scotopic Vision Scotopic vision refers to vision in dim lighting conditions, such as at night. In these low-light environments, the eyes primarily rely on rod cells, which are highly sensitive to light but do not detect color or fine detail. Scotopic vision is most sensitive to the color blue, but it has a very limited ability to distinguish colors overall. Rods function effectively at luminance levels below approximately 0.005 lux. Photopic Vision Photopic vision occurs under bright light conditions, such as daylight or artificial lighting. In these situations, the eyes rely on cone cells, which are responsible for color perception and visual acuity. Photopic vision provides excellent color discrimination. Cones function best at luminance levels above approximately 5.0 lux. Mesopic Vision What we typically consider \u201cnormal\u201d vision is actually a combination of scotopic and photopic vision. This overlapping region is known as the mesopic range, where both rods and cones contribute to visual perception. What is S\/P Ratio? The S\/P ratio is particularly important under scotopic conditions, where rod cells dominate visual perception. The S\/P ratio is a multiplier that indicates how much of the emitted light is effective for human vision. These are referred to as visually effective lumens (VELs). A recommended S\/P ratio falls between 1.8 and 2.0. Generally, white light sources have high S\/P ratios, while yellow or orange light sources tend to have low S\/P ratios. What is Blue Hazard Ranking? The Blue Hazard Ranking measures the risk that a light source poses to eye safety, particularly in relation to exposure to blue wavelengths. Blue light is a type of high-energy visible (HEV) light, which refers to the blue portion of the visible light spectrum. Its potentially harmful effects are mainly concentrated in the 380 nm to 450 nm range. Blue light in the 450 nm to 500 nm range can offer certain benefits. In moderate amounts, blue light contributes to overall well-being and vitality. However, excessive blue light exposure can cause oxidative stress in retinal cells, leading to irreversible photochemical damage and worsening of cell injury in the macula. This is commonly referred to as the \u201cblue light hazard.\u201d The IEC 62471 standard defines the method for assessing the blue light risk from light sources and luminaires. Based on this standard, products can be classified into the following risk groups: \ud83d\udd39RG0: No risk \ud83d\udd39RG1: Low risk \ud83d\udd39RG2: Moderate risk, requiring warning labels \ud83d\udd39RG3: High risk \u2014 even brief exposure to the light source can cause damage. Luminaires in this category are generally not permitted. What is Eb (Blue Light Hazard Weighted Irradiance)? Eb refers to the irradiance of blue light emitted from a small light source, such as an LED. It is measured in watts per square meter (W\/m\u00b2). Blue light irradiance (Eb) is used to calculate the maximum exposure time and to determine classification into Risk Groups. This classification is proportional to the effective irradiance at the retina.The RG1 blue light irradiance limit is 1 W\/m\u00b2\u2014this is the threshold at which the transition from Risk Group 1 (RG1) to Risk Group 2 (RG2) occurs. What is Kbv (Blue Light Hazard Radiation Coefficient)? Kbv is a metric introduced in the IEC\/TR 62778:2014 standard, Application of IEC 62471 for the Assessment of Blue Light Hazard to Light Sources and Luminaires. IEC 62778 provides clarification and guidance for assessing the blue light hazard of lighting products that primarily emit in the visible spectrum (380 nm to 780 nm). Kbv is calculated as Eb divided by the illuminance (in lux). It essentially represents the ratio of blue light hazard potential per unit of luminous energy. These metrics help quantify the potential harm of blue light, particularly to the retina. Eb and Kbv are used by researchers to assess the photometric quantities of blue light that may pose a photobiological hazard. They form the basis for determining a product\u2019s \u201cRisk Group\u201d classification. In essence, Eb and Kbv are technical tools used to quantify and understand the hazards associated with blue light emissions, particularly from various light sources, thereby aiding in the implementation of appropriate safety measures to reduce potential risks.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/lightingrecipe.com\/zh_cn\/s-p-ratio-blue-hazard-ranking-eb-and-kbv\/\" \/>\n<meta property=\"article:modified_time\" content=\"2026-01-21T06:53:14+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=\"4 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/lightingrecipe.com\\\/s-p-ratio-blue-hazard-ranking-eb-and-kbv\\\/\",\"url\":\"https:\\\/\\\/lightingrecipe.com\\\/s-p-ratio-blue-hazard-ranking-eb-and-kbv\\\/\",\"name\":\"S\\\/P Ratio, Blue Hazard Ranking, Eb and Kbv -\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/lightingrecipe.com\\\/#website\"},\"datePublished\":\"2026-01-13T07:42:19+00:00\",\"dateModified\":\"2026-01-21T06:53:14+00:00\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/lightingrecipe.com\\\/s-p-ratio-blue-hazard-ranking-eb-and-kbv\\\/#breadcrumb\"},\"inLanguage\":\"zh-Hans\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/lightingrecipe.com\\\/s-p-ratio-blue-hazard-ranking-eb-and-kbv\\\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/lightingrecipe.com\\\/s-p-ratio-blue-hazard-ranking-eb-and-kbv\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/lightingrecipe.com\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"S\\\/P Ratio, Blue Hazard Ranking, Eb and Kbv\"}]},{\"@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":"S\/P Ratio, Blue Hazard Ranking, Eb and Kbv -","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":"S\/P Ratio, Blue Hazard Ranking, Eb and Kbv -","og_description":"Light enters the eyes through the cornea, where it is then focused onto the retina. The retina contains millions of light-sensitive cells called photoreceptors, which are divided into two types: rods and cones. Scotopic Vision Scotopic vision refers to vision in dim lighting conditions, such as at night. In these low-light environments, the eyes primarily rely on rod cells, which are highly sensitive to light but do not detect color or fine detail. Scotopic vision is most sensitive to the color blue, but it has a very limited ability to distinguish colors overall. Rods function effectively at luminance levels below approximately 0.005 lux. Photopic Vision Photopic vision occurs under bright light conditions, such as daylight or artificial lighting. In these situations, the eyes rely on cone cells, which are responsible for color perception and visual acuity. Photopic vision provides excellent color discrimination. Cones function best at luminance levels above approximately 5.0 lux. Mesopic Vision What we typically consider \u201cnormal\u201d vision is actually a combination of scotopic and photopic vision. This overlapping region is known as the mesopic range, where both rods and cones contribute to visual perception. What is S\/P Ratio? The S\/P ratio is particularly important under scotopic conditions, where rod cells dominate visual perception. The S\/P ratio is a multiplier that indicates how much of the emitted light is effective for human vision. These are referred to as visually effective lumens (VELs). A recommended S\/P ratio falls between 1.8 and 2.0. Generally, white light sources have high S\/P ratios, while yellow or orange light sources tend to have low S\/P ratios. What is Blue Hazard Ranking? The Blue Hazard Ranking measures the risk that a light source poses to eye safety, particularly in relation to exposure to blue wavelengths. Blue light is a type of high-energy visible (HEV) light, which refers to the blue portion of the visible light spectrum. Its potentially harmful effects are mainly concentrated in the 380 nm to 450 nm range. Blue light in the 450 nm to 500 nm range can offer certain benefits. In moderate amounts, blue light contributes to overall well-being and vitality. However, excessive blue light exposure can cause oxidative stress in retinal cells, leading to irreversible photochemical damage and worsening of cell injury in the macula. This is commonly referred to as the \u201cblue light hazard.\u201d The IEC 62471 standard defines the method for assessing the blue light risk from light sources and luminaires. Based on this standard, products can be classified into the following risk groups: \ud83d\udd39RG0: No risk \ud83d\udd39RG1: Low risk \ud83d\udd39RG2: Moderate risk, requiring warning labels \ud83d\udd39RG3: High risk \u2014 even brief exposure to the light source can cause damage. Luminaires in this category are generally not permitted. What is Eb (Blue Light Hazard Weighted Irradiance)? Eb refers to the irradiance of blue light emitted from a small light source, such as an LED. It is measured in watts per square meter (W\/m\u00b2). Blue light irradiance (Eb) is used to calculate the maximum exposure time and to determine classification into Risk Groups. This classification is proportional to the effective irradiance at the retina.The RG1 blue light irradiance limit is 1 W\/m\u00b2\u2014this is the threshold at which the transition from Risk Group 1 (RG1) to Risk Group 2 (RG2) occurs. What is Kbv (Blue Light Hazard Radiation Coefficient)? Kbv is a metric introduced in the IEC\/TR 62778:2014 standard, Application of IEC 62471 for the Assessment of Blue Light Hazard to Light Sources and Luminaires. IEC 62778 provides clarification and guidance for assessing the blue light hazard of lighting products that primarily emit in the visible spectrum (380 nm to 780 nm). Kbv is calculated as Eb divided by the illuminance (in lux). It essentially represents the ratio of blue light hazard potential per unit of luminous energy. These metrics help quantify the potential harm of blue light, particularly to the retina. Eb and Kbv are used by researchers to assess the photometric quantities of blue light that may pose a photobiological hazard. They form the basis for determining a product\u2019s \u201cRisk Group\u201d classification. 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