White LED can be assured in indoor use?

LED light source is very good, but some people have misunderstanding, think LED is harmful to the human eye, even some experts are not used, is engaged in a research professor LED said to me: "we do not need the LED light source, not I do not want to use, is my wife do not want to use, she thinks LED may be harm to human eyes, so much against the use of LED".

In addition to the visual effects of lighting, but also produce biological effects. Why do we get up late in the winter, get up early in the morning, it is light in the control of our biological clock. When the blue light is strong, people do not have the desire to sleep; on the contrary, the blue light is very weak when it is conducive to sleep. So blue light has an effect on the biological rhythm of human beings. Now most of the white LED LED blue light is the way to stimulate the YAG phosphor, blue light radiation peak wavelength and the characteristics of the retinal blue light damage curve and the human body has a relatively large non visual sensitivity curve. In this way, when the indoor use of white LED, some people worry that it will damage the retina, disrupt the biological clock.

As far as I know, the International Commission on illumination (CIE), Van (former chairman of the BommEL the former leader is PHILPS global lighting design and Application Center), he has a positive attitude to LED, do a lot of research work. In his article entitled "the quality of lighting and energy efficiency" (Lighting Quality and Energy) in the article, focusing on the analysis of the impact of the blue light on LED Efficiency. After careful calculation, we get the result: the color temperature of 2700K, and the color rendering index of more than 80 of the white LED blue radiation is less than the same luminous flux incandescent lamp. He believes that color temperature 2700K~3000K, and the color rendering index of more than 80 of the white LED, you can rest assured that the use of indoor.

In addition, I was commissioned by the Air Force PLA General Hospital Department of Dermatology Tian Yan doctor, here on behalf of her to do a related report, she was unable to attend the salon because of physical reasons. But she attaches great importance to the salon.

Tian said in the report, now, CCTV news studio has been using LED lights for lighting. LED lighting in the research project of the CCTV studio, Dr. Tian Yan invited more than 30 volunteers received irradiation experiment for 30 days, using LED light illumination lamps, the test is 2800lx, irradiation time of 15 minutes per day, irradiation time, irradiation for 30 days. The results showed that there was no significant difference in the change of skin color, that is, the color of human skin did not change under the LED light. In addition, the LED light source had no significant effect on the water content and TEWL of the stratum corneum. The experimental results show that LED lighting is safe for skin.

At the same time, she also conducted a comparative experiment, namely 'fluorescent lamp effect on human skin'. The results show that long-term lighting of fluorescent lamps may cause skin damage. The first is the change of skin color index, L value decreased, a value increased, M value increased, E value increased; skin color black and red; and the stratum corneum water content decreased; and when the radiation dose increases, the organizational structure of the skin also changed.