LED lighting has been advertised as a light source in the 21st century. Zhang Shanduan, professor of electric light source at Fudan University, once published a report entitled “Four Elements of Green Lightingâ€, which proposed that green lighting must include energy saving, environmental protection, safety and comfort. With the advancement of light source technology and the improvement of standards, we can continue to discuss in depth the safety and comfort of light.
Solid-state lighting includes LEDs and OLEDs. Currently, OLEDs have not been widely used in general lighting, so this article mainly discusses LEDs. With the elimination of incandescent lamps and the gradual withdrawal of high-pressure mercury lamps, the scope of traditional lighting has been reduced. At present, it mainly includes halogen lamps, fluorescent lamps, high-pressure sodium lamps and metal halide lamps, as well as supporting electrical appliances and lamps.
The indicators for evaluating energy conservation include the light efficiency, lifetime, and lumen maintenance of light sources and lamps. Environmental indicators are emissions of hazardous substances in the production, transportation, operation, disposal and recycling processes, as well as emissions corresponding to the electrical energy consumed during operation. LED does not contain harmful luminescent substances such as mercury, and the light efficiency, life and lumen maintenance rate exceed the traditional light source, so the advantages in energy saving and environmental protection have been recognized.
In terms of safety, all light sources and luminaires are subject to electrical safety mandatory standards. Only the blue light hazard of photobiosafety is discussed here.
The comfort indicators include color temperature, color rendering index, color tolerance, and glare index. The long-term application of traditional light sources is equivalent to setting thresholds for photobiosafety and light quality. Has LED been fully exceeded?
First, the blue light hazard (currently there is light in the blue light, and the relationship between the LED is not large, and the relationship between brightness and color temperature is greater...)
Blue light hazards have international and national standards, and hazard levels and test methods have been standardized. Many research results have been published in journals, conferences, and white papers from the Semiconductor Lighting Alliance.
According to theoretical and experimental studies conducted by Fudan, it is found that the blue light hazard is related to the color temperature and brightness of the light source, and the LED is not substantially different from other light sources.
When the color temperature and color rendering index of the light source are similar, the blue light hazard efficiency of various light sources is almost the same; the blue light hazard efficiency is proportional to the color temperature, so the blue light hazard efficiency of the 6500K light source is 2.4 times that of the 2700K light source, and the effect of color temperature is not large.
The blue-lighted radiance that evaluates the blue-light hazard is proportional to the brightness, and the brightness of the light source varies by a factor of 100, so the blue-light hazard is primarily determined by the brightness of the light source. Controlling the brightness of the light source, the blue light hazard is also controlled.
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