LED blue eye is no scientific evidence of injury

Children staring at outdoor LED advertising screen vision will be impaired, LED lamps will have a short wave of blue light overflow eye injury...... This year, on the LED blue overflow eye injury, the statement appears frequently, some people do not dare to use LED lights. What is the blue light in the LED lamps? Do they really cause damage to the eyes? Is the LED lamp safe? In this regard, the industry generally believes that there is no direct scientific evidence of blue eye injury.

LED Blu ray into the "eye injury killer"?

From incandescent lamps to energy-saving lamps to LED lights, in recent years, the community's attention to energy-saving lighting products more than ever before. Among them, known as the fourth generation light source LED lamps in the industrial capital and government subsidies under the dual impetus of the past two years, showing explosive growth. Wang Kangping, vice president of Shanghai semiconductor lighting engineering association has estimated that if the country's 50% light sources are replaced by LED, then the equivalent of the next year, the province's recycling of Three Gorges Project 2.5. However, in Home Furnishing lighting industry is a thriving stride forward singing militant songs, and some medical professionals and experts have pointed out that the electric light source, LED lamp has many blue overflow problem is serious, will cause the human retina by days and months multiplying irreversible damage.

The same color temperature LED lamp is equally safe

LED lamps and lanterns really can have the damage to the vision? In the days before the meeting of the 2013 Chinese (Shanghai) international semiconductor lighting technology forum, the experts discussed the safety problem of blue light expansion. Professor Mou Tongsheng of Zhejiang University Department of optical engineering, visible light is composed of red, orange, yellow, green, green, blue, purple seven colors of light, which, at a wavelength of 435 to 500 nm corresponding to light blue and green, the scientific community will usually be 400 ~ 500 nm wavelength range is called the "blue zone".

Zhang Shanduan, deputy director of the Institute of electric light sources, Fudan University, associate professor pointed out: the principle of white light LED is a blue chip LED chip to stimulate the formation of yellow phosphor white light. Blue light hazard refers to the light source of 400 ~ 500 nm blue light band if the brightness is too high, the eyes for a long time to see the light source may cause retinal photochemical damage. The degree of blue light damage depends on the amount of blue light absorbed by the human eye under the light. "

From the technical point of view, the current market is commonly used in the LED lamp technology blue chip + yellow phosphor, so that the content of blue light in the LED light is relatively high, but this does not mean that the LED lamp is more eye injury than other lamps. Zhang Shanduan pointed out that in contrast to their experiments, the same color temperature of LED lamps and energy-saving lamps of the safety performance is almost the same.

Reporters learned that the color temperature is the most common spectral quality indicators. Warm light color temperature is relatively low, while the cold light color temperature is relatively high. With the increase of color temperature, the proportion of blue radiation increases and the blue light increases. At the same time, brightness also affects the proportion of blue light. In general, the same color temperature fluorescent lamps and LED lights, as long as the latter's brightness is not more than 3 times the former, basically no harm. However, the individual is too bright LED lamps, the proportion of blue light may exceed the safety value. Zhang Shanduan said, with the gradual maturity of the LED process, manufacturers no longer need to blindly improve the color temperature and power of the lamp to achieve high lumen brightness, but also reduces the possibility of excessive Blu ray.

Urgent need to implement mandatory national standards LED

"If the purchase is qualified and used properly, LED lamps are not more dangerous than conventional lamps. The industry pointed out that the current domestic LED lighting production enterprise has more than 3000, the current national standard "China" Photobiological Safety of lamps and lamp systems, calculation method of blue light hazard and quantization is made clear, and pointed out that the LED lighting products compared with other light sources and there is no difference, which belongs to the exposure limit of safety within the prescribed scope.

But experts say the standard is a recommended standard, rather than a mandatory standard". Professor Mou Tongsheng said that in accordance with international standards have been developed in accordance with the blue light of the Blu ray bio safety standards, and set the possibility of the blue light hazards. For example, will not harm the blue light products called "zero products"; will have small blue eyes harm, not for a long time to open source products called "products"; the light source with large blue light hazard is called "the two categories of products". LED lighting is currently used as the basic zero class and a class, if it is the two category was forced to play the eyes can not stare at".

Industry: LED lamp is no scientific evidence of eye injury

The topic of LED light blue spill harm to eyes, Shanghai ENT Hospital Dean Sun Xinghuai said, LED is not unique to the blue lights, mobile phone and computer screens are rich in blue, domestic and international hospital has not appeared with the use of LED lamps and eye injury clinical cases. National electric light source quality supervision and Inspection Center (Shanghai) director Yu Anqi believes that the answer to this question is as difficult to answer whether the sun is safe. Generally speaking, the sun is safe, but if you look at the sun, it can cause eye burns.

Alliance national semiconductor lighting project and China lighting society recently organized more than 10 domestic well-known experts, specifically on the "blue eye injury" are discussed. The form entitled "ordinary" white and blue lighting LED. White paper on behalf of the group of experts on behalf of Professor Zhou Taiming, white LED light source in the human eye on the blue light radiation and fluorescent lamps and metal halide lamps and other similar light source, will not cause the human eye