Not long look blue LED lights do not hurt the eyes
This year, on LED "overflow blue eye injury," saying many times, and some people can not use LED lights. What in blue LED that? It will hurt the eyes? LED lamps safe? Reporters interviewed experts.
It harmful blue eye
Blue light hazard depends blue total dose received by the human eye, the safety of the same color temperature of the LED lamps and energy-saving lamps is almost the same.
In the recently held 2013 China (Shanghai) International Lighting Application Technology Forum, experts on the blue security issues to discuss. Professor of Information Engineering, Zhejiang University photoelectric Mou introduced with the rise, visible light is red, orange, yellow, green, cyan, blue, purple and seven colors of light, of which wavelength of light corresponding to blue and cyan 435-500 nm, the scientific community is usually the wavelength range of 400-500 nm is called "blue zone."
Lighting Research Institute of Fudan University, deputy director of Shan-end associate professor pointed out: "the principle of white LED is a blue LED chip white light after excitation yellow phosphor conversion of blue light hazard refers to the 400-500 nanometer blue band if the brightness is too high, and the eyes. time may cause retinal photochemical damage after open source blue light hazard depends Blu-ray dose received by the human eye in the light of the accumulation. "
"LED lamps on the market today commonly used technique 'blue chip + yellow phosphor', so that LED lighting in blue light content is relatively high, but that does not mean that LED lights are more eye injuries than other lamps." Shan said end, they made comparison experiment, the same color temperature LED safety lights and energy-saving lamps is almost the same.
Color temperature, light spectral quality is the most common indicators. "Warm light" color temperature is low, and "cold" color temperature is relatively high. After the color temperature increases, the proportion of blue radiation is increased, the blue light increases. At the same time, the brightness also affect the proportion of blue light. In general, the same color temperature fluorescent and LED lights, as long as the latter does not exceed three times the brightness of the former, virtually no harm. But too few bright LED lamps, its blue light ratio is likely to exceed a safe value. Shan side said that with the LED technology matures, manufacturers no longer need to blindly increase the lamp power to achieve high color temperature and lumen, the objective is also to reduce the possibility of excessive blue.
Shanghai EENT Hospital REMEDIES said blue LED lights are not unique to mobile phones and computer screens are rich in blue hospital never received due to the use of LED lights and eye injury cases.
Director of the National Electric Light Source Quality Supervision and Inspection Center (Shanghai) Yuan Qi believes the answer to this question seems to answer the sun is safe as difficult. Generally speaking, the sun light is safe; but if you stare at the sun, the eye can also cause burns.
State Lighting R & D and Industry Alliance and China Illuminating Engineering Society recently organized more than 10 well-known domestic experts, specialized on the "blue eye injury if" questions in the discussion, the formation of a paper entitled "general lighting LED and blue," the white paper. White writing on behalf of the group of experts, Professor Zhoutai Ming introduction, "similar to the white LED light source on the retina of the eye and the Blu-ray irradiance fluorescent and metal halide lamps and other traditional sources, it will not cause harm to the human eye."