LED lighting cool white hazard analysis
LED lighting is composed mainly of blue, blue jeopardize existing international standards and national standards, hazard levels and test methods have been standardized. Many research results have been published in the white paper journals, conferences and semiconductor lighting Union.
According to the theoretical and experimental research in 2013 we found the blue color temperature and brightness of the light source-related harm, there is no essential difference compared with conventional LED light source. When the color temperature of the light source and the color rendering index is similar to the blue light source almost all types of hazards efficiency; efficiency and color temperature is proportional hazards blue, so blue jeopardize the efficiency of the light source 6500 K to 2700 K the light source of 2.4 times, the impact is not great.
Blu-ray evaluation of hazard weighted radiance and brightness is proportional to the brightness of the light source changes range up to 100 times, so the blue light hazard mainly by the brightness decision. Control the brightness of the light, blue light hazard it under control. For less than 6500 K color temperature of the light source, the brightness does not exceed 100kcdm-2, or illuminance of not more than 1000 lx, is blue security (class 0, no danger). Higher brightness light source, if the classification in the low-risk category (category 1), just to avoid the look, use a light source is not limited.
Indoor lighting used conventional light sources, a straight tube fluorescent lamps and compact fluorescent lamps (CFLs) minimum brightness, general illumination within the color temperature range of blue light hazard class belong to 0 (no hazard), are able to look directly at the light source for a long time; halogen and metal halide high brightness, only a short look. High-power high brightness LED single or integrated packaged device, may reach brightness quartz metal halide, such as for spot lights, you can’t see with your eyes directly. Area lighting with LED light source or luminaire, and needs outside of the packaged device a diffusion plate or a diffusion cover to reduce the brightness of an order of magnitude or more, this can also be achieved 0 class blue hazards. If the brightness of a LED light source with similar energy-saving lamps, then it must be blue safe.
Of course, since brightness LED light source and lights to a large number, when make design need to to pay attention to control glare. Overall, general lighting with white LED light source and lighting as long as control brightness, its blue light hazard in a safe range.
Non-visual biological effects are not very clear standard. Existing research results at home and abroad show that the rhythm of the efficiency of the light source and the color temperature is proportional to the same. To meet the body's natural rhythms, interior lighting at night should be a low color temperature of the light source, so not interfere to the body's sleep.