With the increasing popularity of LED lighting technology in home, outdoor and commercial applications, LED lights are becoming more and more common in daily life, and because of their stable light and energy saving advantages, they are favored by consumers.
However, there are news on the Internet that LED blue light can cause damage to the user's retina and even blindness. When the news came out, it immediately received widespread attention from consumers. Some netizens immediately said that they would no longer use LED lights, but many netizens replied, pointing out that this statement has the suspicion of "indiscriminately killing a stick of LED lights". The news should only be directed at "three no inferior LED lights". . So, what does the Blu-ray in the message mean? Is the LED that is generally optimistic in the industry, as rumored, there is a safety hazard of blue light damage to the retina?
Confusion: What is the hazard of blue light and blue light?
It is well known that the light of nature is composed of spectra of various colors. Different wavelengths visually show different colors, such as light with a wavelength of 600~700 nm. We see red light, 500~600 nm light, and we see yellow light. Blue light is light with a wavelength between 400 and 500 nanometers.
Medical experts say that the penetration of light at different wavelengths is different. Lights that are harmful to the eyes are mainly high-energy short-wave light, such as ultraviolet light, blue light, and violet light. The most comfortable thing for the human eye is the medium-wave green light. Blue-violet light penetration is shorter than ultraviolet light. In the visible spectrum, the energy is relatively high, which can penetrate the cornea and lens and reach the retina. Once the retina is damaged, it will cause irreversible damage. Therefore, the most important damage to the human eye in nature is the short-wave, relatively high-energy ultraviolet and blue-violet light.
Some medical experts believe that the light emitted by a general LED lamp has a single color, high brightness, high color temperature, and may contain more blue light components. For a cell, if it accepts a high-energy photon, it may cause some damage to its nucleic acid and protein, causing the entire cell to be fatally threatened. In particular, some LED lamps with unqualified quality may be harmful in three aspects: the first is the blue light content, which damages the retina. The second is that some products are too bright, which will stimulate the eye to constantly adjust, causing eye fatigue. The third is also likely to form glare.
The so-called glare means that the local brightness is too high, and it is not proportional to the surrounding environment, so that the retina produces bright and dark areas, which causes dramatic changes in the pupil. And glare can cause problems such as eyelid swelling. If the glare phenomenon and the stimulating stimulus are relatively large, it will have a negative impact on the human eye. If it is in the blue light hazard and glare phenomenon for a long time, it will aggravate eye fatigue and damage the optic nerve, especially for the visual acuity of young people who have not stabilized yet.
Scientific research has found that the extent to which blue light is injected into the eye is closely related to quantity and age. In the age group of 7 to 19 years old, blue light is about 85% of the retina in the fundus, while adults are generally below 50%, which also indicates that young people absorb more blue light than adults. Therefore, experts recommend that consumers, especially young children, should develop correct and good daily eye habits, and let the eyes relax after one or two hours of continuous use of the eyes, in order to effectively reduce the damage caused by blue light to the eyes. .
Truth: Blu-ray, Blu-ray hazard
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.
It is reported that 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 correct. The human eye is 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.
The damage of blue light to the retina is mainly caused by excessive radiation with a wavelength of 400-500 nm. The data calculated by various light sources and daylight spectra and the measurements of authoritative laboratories at home and abroad indicate that: (1) the blue light content of white LED light source is not higher than traditional light sources such as fluorescent lamps and metal halide lamps and sunlight at the same color temperature; (2) The white light LED light source has similar blue light irradiation on the retina of the human eye, and is similar to traditional light sources such as fluorescent lamps and metal halide lamps, and belongs to category 0 and class 1 safety lighting products.
In order to gain an in-depth understanding of the potential blue light hazards of LED lighting products and to protect the personal safety of consumers, the Fujian Provincial Quality Inspection Institute specially carried out the 2014 LED table lamp product quality and safety risk monitoring, and carried out blue light hazard on domestic LED lamps and lanterns products produced and sold. Check the indicators. At the same time, in order to ensure the dispersion and representativeness of the samples, the Fujian Provincial Quality Inspection Institute screened the LED table lamp products of different brands, different origins, different price points and different power ranges through the market sample purchase method, and then according to the national standard GB/T20145. -2006 for the Blu-ray hazard project test.
The analysis results show that the possibility of blue light hazard of LED desk lamp is f(x) ≥ 0.00001, and the severity of the injury is an allowable risk. According to GB/T22760-2008 "Consumer Product Safety Risk Assessment General Principles", the classification method for the classification of consumer goods hazard is divided into A, that is, there is an allowable risk.
Therefore, consumers do not need to panic when using LED lighting fixtures. When talking about "blue light" color change, as long as the LED lamps manufactured and tested by regular manufacturers are used, it is impossible to cause serious damage to the eyes.
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