China's standards should be upgraded to be mandatory. Relevant research shows that different wavelengths of blue light have different harmful effects on human eyes, and blue light between 435 nm and 440 nm has the greatest harmful effect on eyes, and it gradually decreases with the increase or decrease of wavelength. Among the LED light sources, most of the white light emitted by the light sources is a mixture of blue LED chips and yellow phosphor, and the peak of spectral energy is just in the blue band. "It is precisely because of the rich blue spectrum of white LED lighting products that international standards for photobiological hazards have been established to show the safety that products should achieve." Yu, deputy stationmaster of Shanghai Lighting Product Quality Supervision and Inspection Station and chairman of Shanghai Lighting Society, said that China has a national standard "Photobiological Safety of Lamps and Lighting Systems", which clearly introduces the harm of blue light and the quantitative calculation method. However, many experts attending the meeting said that the current problem is that the standard is a recommended standard, not a mandatory standard, and the implementation of the standard has been discounted. Therefore, experts suggest that it is necessary to upgrade the nature of the standard to mandatory and bring it into the certification standard of lighting. According to the intensity of blue light, LED lamps marked with blue light are classified into zero (no danger), one (low danger) and two (moderate danger) internationally. At present, the LED lighting is basically zero and one, and if it is two, it is mandatory to mark "eyes can't stare". "The current standard limit is based on adult and experimental data, and does not take into account that some special people, such as infants and young children, may look directly at the light source for a long time, thus causing damage to the retina." Sun Xinghuai, dean of the Eye, Otolaryngology Hospital affiliated to Fudan University, pointed out that children with delicate eyes, the elderly and citizens with eye diseases should pay attention to the harm of blue light, and such special people should use zero products.