Recently, the Shanghai Municipal Bureau of Quality and Technical Supervision issued a warning on the quality and safety of smart phone built-in LED flashlight products: children under 10 years old and older people over 60 years old, do not look directly at the built-in LED flashlight in the mobile phone. As LED lighting products gradually entered thousands of households, and the inventors of blue LEDs won the 2014 Nobel Prize in Physics at the end of last year, people's attention to LEDs is increasing. The blue light hazard of LEDs is even more diverse. Some consumers panic. Is there any harm to Blu-ray? Can LED lighting products be used with confidence? The proportion of blue light in LED lamps is not higher than that of traditional light sources. The blue light contained in LED lamps on the market is not higher than traditional light sources such as fluorescent lamps and metal halide lamps. There is no need to panic about LED lamps due to blue light problems. Long-term use of LED lighting products can cause irreversible damage to vision? Will increase the risk of breast cancer? Usually use LED lamps, forget it, don't buy LED desk lamps for children? For these questions, industry experts gave a negative answer. Blue light is an important part of visible light, and it is not terrible in itself. Normal use of LED lamps in daily life will not cause harm. International authoritative experts, participating in the development of light bio-safety standards for the International Electrotechnical Commission (IEC) lamps and lamp systems, and the bio-safety standards for lamps and lamp systems in China, etc., are currently undertaking new technologies such as LED radiation safety in China. Professor Tong Tongsheng, a professor of the Department of Optoelectronic Information Engineering at Zhejiang University, who was established by the standard, told the author. According to Qi Tongsheng, visible light consists of seven colors of red, orange, yellow, green, cyan, blue and purple. Among them, light with a wavelength of 435-500 nm corresponds to blue and cyan, and the scientific community usually has 400-500 nm. The wavelength range is called the blue light region. Due to the short wavelength of blue light, the photon energy is high, and excessive entry into the retina does cause damage. However, in terms of the proportion of blue light, the research data at home and abroad clearly show that the blue light contained in the LED lamps on the market is not higher than the traditional light sources such as fluorescent lamps and metal halide lamps. Therefore, there is no need for the blue light problem. And panic on LED lamps. Sunlight, traditional light sources, and LED lights can cause damage to human eyes and skin, and there are problems with the safety of light radiation. With the advancement of society and the improvement of people's living standards, people have paid more and more attention to this issue. At present, they have also achieved protection against ultraviolet and infrared rays in industrial production. Tong Tongsheng emphasized that in daily life, if you buy a qualified luminaire and use it properly, it will not cause harm. But for infants and toddlers, you should be careful not to let them look directly at the light source for a long time. China's light safety standards are expected to be enforced. According to the current test results, LED lighting products on the market are basically zero class and class, with no or less blue light hazard. In fact, governments and industry organizations around the world have already noticed the possible harm caused by excessive blue light. In the past 10 years, they have developed light biosafety standards for blue light according to the intensity of blue light, setting various possible blue light hazards. Value. Such as IEC62471:2006 "Photobiosafety of Lamps and Lamp Systems", IEC/TR62471-2:2009 "Photobiosafety of Lamps and Lamp Systems - Part 2: Manufacturer's Guide", IEC/TR62778:2012 "Light Sources and Standards for Photobiosafety Blu-ray Damage Assessment for Luminaires and China's GB/T20145:2006 "Photobiosafety for Lights and Lamp Systems". According to Qi Tongsheng, in the relevant IEC standards, the light source products without blue light hazard are called zero-type products; the light source products with small blue light hazard and the eyes can not be directly viewed for a long time are called one type of products; The source of the hazard is called a second-class product, and it is mandatory to mark the eye on the product. Of course, a high level of risk does not mean that it is not safe, but it must be used properly. Considering China's national conditions when the standards were formulated in 2004, this standard is designed as a recommended standard rather than a mandatory standard in China. This is a great regret. Yan Tongsheng said that the next version of the standard will be introduced as soon as possible and become a mandatory standard. However, although the standard is not enforced, according to the current test results, the current LED lighting products on the market are basically zero class and one class. As the article begins with the Shanghai Quality and Technical Supervision Bureau on the quality test results of smart phone built-in LED flashlight products, the blue light damage of 19 batches of built-in LED flashlights is a kind of danger (low risk), that is, under normal exposure conditions, the lamp is dull Biological hazards. For normal adults, the eyes can't look at a class of products for a long time, so it is recommended that children under 10 years old and those older than 60 years old should not look directly. At present, many companies are working to reduce blue light in LED light sources. It is reported that Shenzhen Ruiouguang Technology has released an inner coated glass tube, which uses the special phosphor in the coating to convert the surplus blue light into red and orange, and strive to maximize the natural spectrum. Health is a new topic. Compared to traditional light sources, LEDs are easier to implement intelligent control. If you can use LED to achieve healthy lighting, scientific lighting, this will be the biggest driving force for the development of LED lighting industry. Compared with the blue light hazard detection system that has been perfected 10 years ago, how to adjust the proportion of various light sources including blue light to achieve healthy lighting and scientific lighting has become the latest topic in the industry. Yan Tongsheng told the author that different spectrums of radiation will cause changes in the secretion of various hormones in humans, thus affecting people's syllabic rhythms. In the case of Blu-ray, for people who are working normally, a relatively high proportion of blue light is needed during the day to enhance people's work mood, and at night, a lower proportion is needed to help get into sleep. So for people who are prone to insomnia, the more blue light you receive on your computer and mobile phone screen at night, the harder it is to fall asleep. By transforming the spectrum, not only can this early function be awakened, but it is also possible to prevent and assist in the treatment of various diseases by stimulating glandular secretion. Yan Tongsheng said, of course, this influence is subtle and often takes a long time to be reflected. This further increases the difficulty of clearing relevant specific indicators to improve the system. There is still a lot of work that needs to be shared by the entire industry. Work hard. In order to promote the development of healthy lighting technology, in November 2012, the International Organization for Standardization established the ISO-TC274 Light and Lighting Technology Committee. At the 2nd working meeting of TC274 in March last year, it was clear that the study of the effects of light on people and living things should be the main work of the near future. In April this year, the third working meeting will be held in Beijing, and the global industry will exchange the latest research progress on the non-visual impact of light on the human body. Compared to traditional light sources, LEDs are easier to implement intelligent control. If you can use LED to achieve healthy lighting, scientific lighting, this will be the biggest driving force for the development of LED lighting industry. Tong Tongsheng is full of confidence in the future.
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