Is LED Blu-ray really safe

Recently, it was reported that medical experts are concerned that LED blue light will cause damage to the retina, and even blindness. This news has caused widespread concern among netizens and a lot of forwarding comments on the Internet.

LED Blu-ray overflow may cause damage to the retina? Test results in recent days have shown that there are indeed risks for commercial parts that are in abnormal use. Is LED light called the fourth generation light source really unsafe? What is LED Blu-ray overflow? Is it a "potential killer" for wounding? This reporter conducted a related investigation.

What does LED Blu-ray overflow mean?

The data shows that at present, China has become one of the largest LED lamp producing countries in the world. The "Twelfth Five-Year Plan for the Development of Semiconductor Technology" released by the Ministry of Science and Technology in 2012 stated that by 2015, the share of LED in the general lighting market will reach 30%, and the domestic scale of semiconductor lighting will reach 500 billion yuan. These stimulus policies have made the development of China's LED industry catch up with Europe and the United States and other developed countries. However, some medical experts have expressed concern that many LED lamps on the market suffer from Blu-ray overflow problems. Over time, the retina of the human eye is subject to irreversible damage.

According to Yu Anqi, deputy director of the Shanghai Municipal Lighting Product Quality Supervision and Inspection Station and director of the Shanghai Illuminating Society, the blue light is a light that has always existed in the natural world and is an important part of the sunlight. It must also exist in all kinds of white light sources. We live in Everywhere in the environment there is "blue light," so it is unreasonable to equate "blue light" with "retinal damage." However, many LED lamps on the market today emit blue light through the chip and excite yellow phosphors to reconcile into white light, which makes the blue light spectrum of white light products richer than other light sources.

Cross-border experts "consultation" LED Blu-ray: LED is insecure?

Representatives of the medical community: As for the dangers of blue light, Jiang Chunhui, chief physician of the Shanghai Wuguan Hospital, puts forward: “Through the experiments on mice in recent years, the damage of blue light to the visual cells has become conclusive, and in-depth research results have continued to emerge.” But Yu Anqi There are different views. He pointed out that the “blue-rich” environment and the normalized environment that are under intense exposure are two different concepts. However, he also stressed that it was because of the rich blue light spectrum characteristics of white LED lighting products that they had international standards for photobiological hazards, which suggested that the products should achieve safety.

Expert of the electric light source circle: Dr. Yang Weiqiao, deputy director of the National Semiconductor Lighting Application System Engineering Technology Research Center, said that there is no direct scientific evidence that Blu-ray is hurt. Dr. Zhang Shanduan, deputy director of the Institute of Electric Light Sources at Fudan University, said that the most recent example of blue light damage is the blue light of Yuba’s lamp that caused the eyes of a baby in Xi’an to be burned and eventually lead to blindness. He identified a national standard called "photobiological safety of lamps and lamp systems" and had a section devoted to the calculation of blue light hazards and quantification. He said that, unfortunately, this is just a recommendation and it is not mandatory for manufacturers. At present, there is almost no threshold for entering the LED industry. Especially in the downstream assembly of lighting manufacturers, there are many hand-workshops in the form of a husband-and-wife shop. There is simply no quality control system. The industry is now furiously arguing that there is no need for mandatory photobiological safety testing of LED luminaires.

Launch LED blue light risk monitoring: Prior to this “consultation”, the Shanghai Lighting Product Quality Supervision and Inspection Station collected 27 LED samples from different channels, covering types of table lamps, spotlights, downlights, panel lights and light bulbs. According to the IECEECTL (International Electrotechnical Commission-Laboratory Committee) decision DSH0744 to determine the blue light hazards, the result is: Under normal use, 14 are classified as non-hazardous 0, 13 are classified as low risk 1 and are all safe. The range. However, if it is used in an abnormal state, ie, the front diffuser cover is removed, there is one class that has reached a dangerous level. Yu Anqi pointed out that necessary structural protective measures or warning signs should be taken for such products. Yu Anqi also suggested that relevant departments carry out special risk monitoring for indoor use of LED lighting products against blue light hazards, so that LED lighting products will develop in a healthy direction. The Shanghai Product Quality Safety Evaluation Research Center has started relevant risk monitoring projects.

LED Blu-ray: Which three types of people are vulnerable?

Vulnerable to three types of people: Children with delicate eyes, people with diabetes, and people who take medications are most vulnerable to blue light. Because the baby's lens is relatively clear, it is difficult to filter blue light. At the age of 0-2 years, about 70-80% of blue light can penetrate the lens to reach the retina; between 2 and 10 years old, about 60-70% of the blue light will reach the retina. Therefore, in the treatment of neonatal jaundice with blue light, the doctor must use black cloth to cover the baby's eyes to avoid injury.

After more than 10 years of development, diabetes has retinal lesions. The retinal exposure to light damage is greatly reduced. There are drugs. Many drugs in our lives are photosensitive. After we take medicine, the light may be damaged. More obvious. The reporter interviewed medical experts and learned that there are no less than 20 kinds of photosensitive drugs, among them, doxycycline, ciprofloxacin, and oral hypoglycemic agent D-860 are commonly used. After taking these medicines, patients should not only be careful with their lights, but should also be especially careful about the sun.

Avoid blue light damage, precautions

In the room, the color temperature is lowered. The so-called color temperature is a measure of the light color of the light source. The low color temperature is what we usually call warm light, with more red components and less blue components. On the contrary, the bluish cold light, the color temperature is relatively high. In our common light source, the color temperature of the candlelight is about 2000K, the incandescent lamp is 3000K, the morning light is about 4400K, and it rises to 5600K at noon. Yu Anqi, senior engineer and director of the Shanghai Institute of Illumination, said that it is ideal for people to use up light at different times of the day and conform to the laws of nature. Currently, the LED lights on the market are generally high in color temperature, which will interfere with the body's biological clock.

Home lighting settings have their own focus on how to use the light the most suitable? Xinguang Hospital professor of neurology counseling psychology professor Dai Guangming suggested that home lighting should be soft, not too bright or too dark, should not be dazzling and contrast too much; bedroom is best not to use exciting light colors, and should avoid the color Strong contrast, avoid red and green. In a room, it is best not to have more than 3 types of lights, and all colors should be coordinated. For the elderly and children, the choice of light source is also different.

It is best not to hang the headlights in the room of the elderly, because old people get used to the night, if they suddenly encounter a particularly harsh light in the middle of the night, it will affect their sleep.

Some elderly people like to read in bed, so the bedside light should be slightly brighter.

The room lighting of the elderly should be warm, which will make the room very warm and the light source not too complicated.

For the children's room, Professor Bai Ji, deputy director of Ophthalmology Department of Daping Hospital, said that the use of light is related to the health of the child's eyes, so pay special attention to whether it is the use of white light or yellow light. Maintaining light is the highest principle. “Every child's focus on using light sources is different during each period, and adjustments should be made according to the needs.” Professor Bai said that if preschoolers do not need a lot of reading, they can install bedside lamps on their heads and Adults can accompany him to read before going to bed.

In addition, Prof. Bai also reminded that many parents like to turn down the light when the children are sleeping. “This will easily damage the child’s vision and it is also prone to symptoms such as precocious puberty. It should be avoided.”

Buy LED should pay attention to color temperature parameters

In this "consultation", the professional word "color temperature parameters" has also attracted everyone's attention. It is reported that natural light is high at midday and the color temperature is low in the morning and dusk. Due to the high blue light content in high color temperature lighting products, using such products in the office space is beneficial to boost the spirit. However, if it is used at night, it may affect sleep and cause a disturbance of the biological clock, thereby reducing human immunity. Therefore, Yu Anqi emphasized that while paying attention to the potential harm of LED blue light to the retina, we must also pay attention to the effects of the “blue-rich” LED lighting products, that is, high color temperature lighting products on the human rhythm. Honorary Chairman of the Shanghai Illuminating Society, Zhang Hailu, suggested that the color temperature of indoor LED lighting products should not exceed 4000K. For smart home products, LED lighting products with a color temperature of 5000K and above should be avoided.

What other blue light sources?

In life, there are many light sources that can emit blue light. Peng Ling, the test division of Chongqing Aisang Optometry Center, introduced that in addition to Yuba, flat panel displays, LED neon lights, fluorescent lamps, LCD monitors, ipad, and large-screen mobile phones all have background light sources, and the light source excited by powerful electron currents contains abnormalities. The high-energy short-wavelength blue light affects the child's retina and should avoid long-term vision.