At present, the safety of LED light sources for human eyes and organisms is attracting attention from all over the world. It is not unreasonable to consider the potential impact of LEDs. Due to the narrow spectrum and high brightness of the solid-state light source, the bio-safety of lighting has even caused some people to show "worry". In the "Yuba injury" incident reported by the media some time ago, the innocent blue light was regarded as the "culprit". If this is a "misreading" of the public because of the familiarity with LEDs, how should we scientifically define the impact of LED light sources on the human eye and how to determine the safety of LEDs in different applications? Sex? Especially for LEDs that are being mass-produced and entering the market, is there a recognized scientifically quantifiable standard for “health lighting”? Obviously the latter is of great significance to the overall industry development and many manufacturing companies.
In fact, in the standardization and measurement of light safety, a lot of research work has been done both internationally and domestically. IEC TC-76 and CIE D6 are revamping IEC62471/CIE S009, and IEC TC-76 is also drafting IEC62471 series standards. Two attachments, including the fourth part of the guidance on measurement methods. On November 20, 2012, the National Semiconductor Lighting Engineering R&D and Industry Alliance Standardization Committee (CSA Standardization Committee) standard review and standardization work report meeting, in the evaluation of five industry standards, "CSA 019-LED lighting The General Specification for Product Inspection and Testing also introduces the test method for electrical and electronic products for the first time to evaluate the quality of LED lighting products and standardize the quality evaluation system for LED lighting products, including the content of “photobiosafety”.
For the issue of LED "photobiosafety", many domestic experts have also expressed their views from their respective perspectives.
Professor Zhou Taiming from Fudan University said that LED products below 4000K can be used with confidence. He told reporters that the current public is worried that LEDs will hurt people's eyes because they don't understand. Some experts even dare not 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. Professor Zhou Taiming said 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.
Designers who have always been concerned about this issue have also expressed their views. Xu Qinghui, design director of Guangzhou Kebo Lighting Design Co., Ltd. and member of the Chinese Lighting Designers Association, recently put forward his own views on classroom lighting in primary and secondary schools on his own Weibo: it is recommended that the lighting of primary and secondary classrooms should not be rushed to replace with LED; Even if LED is used in school, it is recommended to use 4000K, do not use too high color temperature; and it is recommended that households choose LEDs also do not choose white light color, should use about 3000K warm white light; LED table lamp, it is recommended to use 3300K halogen tungsten light source eye protection table lamp. At the same time, Xu Qinghui revealed on his Weibo that China Academy of Building Research is preparing to make strict regulations on the indoor use of LED light sources in GB50034-2013, which will be issued next year, one of which is that the color temperature must be lower than 4000K; He also pointed out that this year's "Electric Building Design Code for Civil Buildings" JGJ 16-2008 Section 10.9 Building Landscape Lighting also clearly states that "avoid avoiding the use of light sources with a color temperature higher than 6000K alone."
Dr. Chen Wencheng, senior application engineer at the Asia Application Design Center of OSRAM Opto Semiconductors, said that it is not necessary to talk about blue light and the color change. The appropriate blue light component has great positive significance for the body's biological clock adjustment. He believes that in terms of blue light hazard, people should pay attention to the fact that the damage is not the blue light itself, but the energy it contains. You stare at the blue sky and there won't be any problems, but even if you look directly at the sun for a little while, it can also cause retinal damage. The energy absorbed by the retina depends mainly on the light intensity and the time it is staring at it, and it also has a certain relationship with the color temperature.
Lin Yandan, an associate professor in the Department of Light Source and Lighting Engineering at Fudan University, believes that in the era of new LED light sources, we can only grasp what people really need, master the characteristics of the spectrum and adjust the spectrum, that is, fully consider the radiation of light, and take into account human Visual and safety needs to achieve a better and healthier lighting. She also reminded that not only lighting, Ipad mobile phones and other flashes are basically high-power white LEDs, blue light content, when the intensity and gaze time is enough, it may damage the retina, for young children, try to avoid close-up gaze flash and each A blue-and-white LED light-emitting toy to avoid high transmittance of the lens.
In summary, it is certain that the LED light source is safe as long as it follows the correct indicators, reasonable design, and appropriate application. For enterprises, the development of products should focus on optical design, focusing on glare, color temperature, color rendering index and other indicators, in terms of light efficiency, light comfort, but also make different choices according to the different environments. Another point of view is that for finished luminaire manufacturers, the purpose of changing the physiological radiance can be achieved by designing, by appropriately changing the distance between LEDs and replacing a single high-power LED with more low-power LEDs.
(This article is reproduced on the Internet. The texts and opinions expressed in this article have not been confirmed by this site, nor do they represent the position of Gaogong LED. Readers need to verify the relevant content by themselves.)
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