From what aspects do consumers want to prevent LED blue light hazards?
From what aspects do consumers want to prevent LED blue light hazards?
Release date: 2017-08-11 Source: OFweek semiconductor lighting sharing: 
Nowadays, the most popular sales in the lighting industry in the market is LED lights . With the continuous development of technology, lighting sources are constantly innovating with the advancement of technology. These kinds of light sources are also enriching lighting products and satisfying people's needs. It will cause harm to people because of improper use. The blue light hazard has continued to cause a lot of repercussions in the lighting industry since it was first exposed. Recently, more medical experts worry that LED blue light will cause damage to the retina, even blindness. This news has attracted a lot of attention from netizens and a large number of forwarded comments on the Internet, and it has also attracted the attention of light source experts.
"Blu-ray" refers to the portion of the visible light that is closest to ultraviolet light. These wavelengths are slightly lower than the ultraviolet light in the range of 400-500 nm. They are the most energetic part of visible light, and the colors are blue and purple. For "Blu-ray."
The so-called blue light hazard refers to the damage caused to the human eye in a short time or moment when the blue light radiance reaches the standard 2 or 3 standard. The standard is based on GB/T 20145-2006/ CIE S009/E: 2002, the basis for the decision is the CTL-0744_2009-laser resolution.
For the blue light hazard of LED, the scientific community also has a lot of disputes. One of the points is that it is consistent with the opinions of the medical experts above. Light enters the human eye with two visual channels, one for the imaging vision channel and the other for the non-image-aware channel of the circadian clock and the hour. They believe that the blue light of LED luminaires may cause visual damage to the retina in the imaging visual channel. On non-imaged channels, the blue light of an LED luminaire may have an effect on the circadian rhythm.
At present, the LEDs for illumination on the market are basically all white LEDs, which are stimulated by a blue chip to form a yellow phosphor and compositely form white light. Although this method obtains white light at the lowest cost, due to the use of blue light pumping, it is inevitable that it will contain excessive blue light components, and the higher the color temperature, the more. Recently, although the country has issued some standards for LED blue light hazards, these standards are for adults and may not be suitable for young children.
For the problem that blue LED can enter the classroom, he once worked at Harvard Medical School in the United States. Professor Zhou Wenliang, a professor of doctoral tutor at the Zhongshan University of Science and Technology, said, “If you want to use auxiliary light source, most of the LED lights in the market are too strong. From the perspective of protecting young people's eyes, I personally do not advocate using it in the classroom for the time being."
Professor Zhou Wenliang said that white LEDs used in the color temperature range defined by national standards are safe for adults in strict accordance with national standards. In the past few years, the rapid development of white LEDs has strongly promoted the semiconductor lighting industry. Great development. However, white LEDs are only one of the semiconductor lightings, which have outstanding advantages and are good for general indoor lighting. But for children and adolescents, the risks are there, especially in classrooms where students have to take longer. Excessive blue light may be a disorder that causes retinal damage and human birth rhythm.
At the same time, according to the "Washington Post" report, the American Medical Association issued a warning last June that high-intensity LED street lights in Seattle, Los Angeles, New York and other places, release invisible blue light, interfere with the pace of sleep. It may also increase the risk of cancer and cardiovascular disease. The Medical Association also warned that LEDs affect the driver's night vision. The American Medical Association urges states and cities to reassess the strength of existing LED lights.
For the problem of LED blue light hazard, there are many people who think it is the biggest rumor. It is understood that at present, the new EU standards have included Blu-ray retinal hazards in the assessment of the safety of digital products. According to the European Union's test standard IEC/EN62471 for laser products (including LED), and the light biosafety of China's national standard GB/T20145-2006 lamp and lamp system, blue retinal hazards can be divided into four types: no danger , low risk (category 1), medium risk (type 2), high risk (category 3).
According to the relevant regulations, only the manufacturer has provided that the radiance of the luminaire is non-hazardous or low-risk (category 1), and the certification body can accept such LED luminaires and believe that it will not produce photobiological hazards under normal conditions. If the radiance of the luminaire is of Class 2 or Class 3, it cannot be used directly without warning signs. In other words, only when the brightness of the blue light reaches the Class 2 or Class 3 hazard level, it may cause damage to the human eye in a short period of time or in an instant, resulting in a blue light hazard.
At the 7th Shanghai International New Light Source & New Energy Lighting Forum, experts from the academic, industry, and medical circles have reached a basic consensus. The main conclusion is that the correct use of qualified general-purpose white LED products is for people. The eyes are completely safe. Blue light is an essential component of white light. Like daylight and traditional light sources, white LEDs also contain blue light. Appropriate amount of blue light is not only necessary to ensure the color rendering performance of the light source, but also has a regulating effect on the human circadian rhythm.
So, in terms of product design, what aspects can consumers prevent LED blue light hazards?
1. Adjust reading habits. Moderately reduce the brightness without hindering reading and viewing. In addition, it is to watch reading on a mobile phone, iPad, computer or TV. The problem is not the blue light, nor the radiation of these common gimmicks. These electronic products are not a big problem in their own right, but their appearance has greatly increased the length of our "reading and watching" time of day.
2. Select lamps according to national standards. Since consumers can't judge whether Blu-ray is over-standard, what we can do is to check whether the implementation standard on the package is GB7000.1-2015 when purchasing the luminaire. After all, the luminaires are included in the compulsory product certification catalog (commonly known as "3C certification").
3. Adopt OLED light source. As a new generation of mainstream lighting technology, OLED has many advantages, using a new generation of technology, no glare, no UV, no blue light, no purple light hazard of fluorescent lamps, and many other advantages, can create a healthy eye environment. At the same time, the light source has low energy consumption, low heat generation, and environmental protection, which gives the eyes a very comfortable feeling.
Label: What are the consumers' LED blue light hazards from those aspects?
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