On July 19, 2011, the National Semiconductor Lighting Engineering R&D and Industry Alliance held a salon on the theme of â€œThe Impact of LED Light Sources on Human Eyes and Biologyâ€ at the Yifu Science and Technology Building of Fudan University in Shanghai. More than 30 people came from different Experts from the field and industry representatives gathered to discuss the topic in a warm and in-depth manner. At the meeting, the impact of LED on the retina and skin, how to make good use of the LED light source, was discussed in detail, to what effect each wavelength has on the organism, what research should be carried out, and the effect of light on melatonin. And changes in biological rhythms and biological clocks.
"Today's discussion made us very excited. Experts in various fields can say that there is a consensus that LEDs give us a choice of light source. When we need an effect, we can control it to achieve it. In the future, LED companies can have more room for product development, and different products can be used to manufacture different products. Of course, there are still many researches on applications. Now we have some research in the international arena, we should keep pace. In the international realization of many aspects of the lead." Lin Yandan in the summary of the future direction of LED.
At the salon, Professor Zhou Taiming from Fudan University, Qi Tongsheng, Chairman of Hangzhou Zheda Tricolor Instrument Co., Ltd., Yu Anqi, Executive Deputy Director of National Electric Light Source Quality Supervision and Inspection Center (Shanghai), and other well-known industry experts, as well as Zhongshan from the medical community. Professor Gu Huaiyu from the University School of Medicine, deputy director of the Department of Ophthalmology and Visual Science, Shanghai Medical College, Fudan University, and Dr. Ding An, deputy director of the Department of Ophthalmology and Visual Science, Shanghai Medical College, Fudan University, Director of the Department of Dermatology, Second Artillery General Hospital of the Chinese People's Liberation Army And well-known LED companies at home and abroad, such as the special support unit of this salon, NVC, as well as Shanghai Yaming Bulb Factory Co., Ltd., Nanjing Handerson Technology Co., Ltd., Midea Lighting, Tsinghua Tongfang, Pinneng Optoelectronics and Philips High-level representatives from companies such as Cree participated in the salon discussion. The wonderful speeches of various representatives made the atmosphere of the salon venue very active. The applause and the laughter from time to time were always accompanied by the salon.
â€œI have never been able to get so much information at the same time in a seminar!â€ Lin Yandan, an associate professor of the Department of Light Sources and Lighting Engineering at Fudan University, said excitedly at the salon â€œThe Impact of LED Light Sources on Human Eyes and Biologyâ€. .
Health lighting project deployment
As a new type of light source, LED lighting has achieved rapid development in technology and application in recent years. At the same time, LED light source is also receiving more and more attention to the safety of human eyes and organisms: What effect does LED light source have on the human eye? As a carrier of healthy lighting, LED will be more widely used in our lives. How to determine the safety of LEDs in different applications? Is there a quantitative standard for LED health lighting? How to use the research and development results of health lighting to truly integrate with the market and scientifically guide enterprises to develop safer and healthier LED lighting products? All of this involves a very important issue - photobiosafety and health.
In recent years, the light biosafety of LED has attracted the attention of the international community. At the 27th CIE Conference just concluded in Sun City, South Africa, photobiosafety and health lighting is also a hot topic of discussion. China's â€œTwelfth Five-Year Planâ€ 863 Program Semiconductor Lighting Major Project â€œLED Photometric, Chromaticity and Health Lighting Researchâ€, which was launched in advance in 2010, has deployed LED health lighting. The research objectives of this project are: to develop evaluation techniques such as brightness distribution, glare, color rendering and intermediate vision of LED lighting products; to establish LED light bio-health and hazard evaluation methods and evaluation platforms; to carry out LED non-imaging optical research and establish a design database. The main research contents include LED lighting product brightness distribution, glare, color rendering and intermediate vision evaluation methods and measurement techniques, as well as research on LED health lighting based on photobiological effects, and establishment of health and hazard evaluation methods and measurement platforms for LED lighting products. .
Since the LED is a point light source, if it is used improperly or the light distribution is unqualified, the harm to the user will be very large. With the increasing use of indoor and outdoor high-power semiconductor lighting products, the "12th Five-Year" semiconductor lighting special plan also plans to deploy high-power semiconductor lighting products optical radiation safety research projects, mainly for semiconductor lighting products and semiconductor lighting The research on optical radiation characteristics, the establishment of hazard limits and hazard classification, and the development of optical radiation hazard detection methods and testing equipment for semiconductor lighting products with independent intellectual property rights.
"The safety and health of LED light sources is urgent and significant, which is not only related to the application feasibility and market acceptance of LED as a new light source, but also opens another brand new sky for LED applications--to health care These broader areas of application extend the commercial space and opportunities, which is interesting and instructive," said one business community representative. This is also the purpose of this salon event. On the one hand, it conducts a wide range of opinions on national issues, and on the other hand, it guides the development of LED innovation applications.
Reasonable design and use will extend LEDs from safe to healthy applications
At the meeting, Professor Zhou Taiming from Fudan University said that the public is worried that LEDs will hurt people's eyes, and many experts are afraid to use them. The former chairman of the International Lighting Commission also had a process for the use of LEDs. At the beginning, he also had doubts about LEDs. But now his attitude is very positive, and he has done a lot of research work. He has an article called "Inconsistent Quality and Energy Efficiency of Lighting." This document focuses on the impact of LEDs on human injury. At the same time, the calculation was made at the same time. The conclusion was that we can use the white LED with a color temperature of 2700K-3000K and a color rendering index of 80 or higher. The use of 6000K at home is harmful.
In addition, Professor Zhou also gave a report on the dermatologist Tian Yan of the Beijing Air Force General Hospital who was unable to attend due to physical reasons, and introduced Dr. Tian's work in photobiosafety. Dr. Tian Yan invited more than 30 volunteers to receive a 30-day lighting experiment. The lamps used LED light source and the color temperature was 2800K. The experiment found that the volunteer skin did not change. Therefore, the experimental results prove that LED lighting is safe for the skin. At the same time, the fluorescent lamp contrast experiment was carried out. The results showed that the fluorescent lamp illumination was harmful to the skin, the color of the skin changed, the L value decreased, the M decreased, the A value increased, and the E value increased. The color of the skin turns red and the water content of the skin also tends to decrease.
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