stic diffusion panels. When purchasing for children, low color temperature lighting fixtures should be selected. Zhang Shanduan said that after conducting experimental tests on various light sources such as LED, incandescent, energy-saving, and halogen lamps, they found that LED lamps with transparent emitting surfaces have much higher "blue light dose" than incandescent and energy-saving lamps. However, LED lamps with plastic diffusion panels on the emitting surface have very low blue light dose, lower than incandescent and energy-saving lamps. Therefore, when using LED lights for indoor lighting, it is recommended to choose lamps with plastic diffusion plates.
At present, the commonly used technology for LED lamps in the market is' blue light chip+yellow fluorescent powder ', which results in a relatively high content of blue light in LED lights. However, this does not mean that LED lamps are more eye damaging than other lamps. "Zhang Shanduan said that in their comparative experiment, the safety of LED lamps with the same color temperature and energy-saving lamps was almost the same.
Color temperature is the most universal indicator of the spectral quality of a light source. Warm light has a lower color temperature, while cool light has a relatively higher color temperature. After the color temperature increases, the proportion of blue radiation increases, and blue light increases accordingly. Meanwhile, brightness also affects the proportion of blue light. Generally speaking, for fluorescent lamps and LED lamps with the same color temperature, as long as the brightness of the latter does not exceed three times that of the former, there is basically no harm. However, some excessively bright LED lighting fixtures may have a blue light ratio that exceeds the safe value. Zhang Shanduan said that with the increasing maturity of LED technology, manufacturers no longer need to blindly increase the color temperature and power of lamps to achieve high brightness, which objectively reduces the possibility of excessive blue light.
Sun Xinghuai, the director of Shanghai Eye, Ear, Nose and Throat Hospital, said that blue light is not unique to LED lights. Both mobile phones and computer screens are rich in blue light, and the hospital has never received a case of eye injury caused by the use of LED lights.
Yu Anqi, director of the National Electric Light Source Quality Supervision and Inspection Center (Shanghai), believes that answering this question is as difficult as answering whether too much sunlight is safe. Generally speaking, sunlight is safe; But if you stare at the sun, it can also cause eye burns.
The National Semiconductor Lighting Engineering R&D and Industry Alliance and the China Lighting Society recently organized more than 10 well-known experts in China to discuss the issue of whether blue light is harmful to the eyes, and formed a white paper entitled "General Lighting LED and Blue Light". Professor Zhou Taiming, the expert representative of the white paper writing team, introduced that "the blue light irradiation of white LED light source on the retina of the human eye is similar to that of traditional light sources such as fluorescent lamps and metal halide lamps, and will not cause harm to the human eye
