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How to deal with the blue light overflow problem of LED lamps
Recently, it has been reported that LED blue light spillage may cause damage to the retina, even blindness. Is the LED light known as the fourth-generation light source really unsafe? Experts suggest that LED lights sold in the market should clearly indicate which type of standard is used and which should be used with caution.
China's standards should be promoted to mandatory
Related studies have shown that the blue light of different wavelengths has different effects on the human eye. The blue light between 435 nm and 440 nm has the greatest harmful effect on the eyes, and the effect gradually decreases as the wavelength increases or decreases. In the LED light source, since the white light emitted by most of the light sources is mixed by the blue LED chip and the yellow phosphor, the peak of the spectral energy is just in the blue light band.
"It is precisely because of the rich characteristics of the blue light spectrum of white LED lighting products that the international standard of photobiohazard is obtained, which indicates the safety that the product should achieve." Deputy Director of Shanghai Lighting Product Quality Supervision and Inspection Station, Yu Anqi, chairman of the Shanghai Lighting Society, said that China has a national standard for "photobiosafety of lamps and lamp systems", which provides a clear introduction to the blue light hazard and quantitative calculation methods.
However, many experts at the conference said that the current problem is that this standard is a recommended standard, not a mandatory standard, and the standard's execution power is discounted. Therefore, experts suggest that the nature of the standard needs to be promoted to mandatory and included in the lighting fixture certification standards.
Labeling LED lights with Blu-ray labels
Zhai Tongsheng, a professor at the Department of Optoelectronic Information Engineering at Zhejiang University, told Dongfang.com that internationally, according to the intensity of blue light, there are zero (non-hazardous), one (low risk), two (medium dangerous), etc., which are currently used as LED lighting. Basically zero class and class, if it is the second class, it is mandatory to be "eyes can not stare at."
“The current standard limits are based on adult and experimental data and do not take into account certain special populations. For example, infants and young children may look directly at the light source for a long time, causing damage to the retina.†Fudan University Eye and ENT Hospital Dean Sun Xinghuai pointed out that children with delicate eyes, old people and people with eye diseases should pay attention to the danger of blue light. This special group should use zero-grade products.
However, LED luminaires on the market do not clearly indicate which type of blue light it is. "Although it is currently used as a basic class and a class of LED lighting, it is difficult to distinguish between zero and one class because there is no regulation." In this regard, the vice president of the Institute of Electric Light Sources, Fudan University Chang Zhangshan Rui suggested that in the future, LED lights sold on the market should clearly indicate which type of standard is used and which should be used with caution. In this regard, Yu Anqi agreed, he believes that the future LED lights, may be labeled with Blu-ray.