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Correct Interpretation Of Health Problems Caused By LED Lighting
Nov 15, 2018

Previously, relevant experts and scholars have suggested that the blue light in the illumination has a certain weighted damage to the human retina. Recently, relevant research found that LED lighting has induced health problems, saying that people who work and live in LED white light pollution environment for a long time, the retina and iris will be damaged to varying degrees, the visual acuity drops sharply, the incidence of cataract Up to 45%. It can also cause dizziness and upset, and even symptoms such as insomnia, loss of appetite, depression, physical weakness and the like.

According to optical experts, the reflected light of mirrored building glass is stronger than that of sunlight, and its reflectivity is as high as 82% to 90%. The light is almost completely reflected, which greatly exceeds the range that the human body can bear.

In addition, research papers have pointed out that LED lamps contain lead, arsenic and dozens of other dangerous substances. White LED lamps have the least lead content, but there is still a large amount of nickel, a heavy metal that can trigger an allergic reaction. The level of copper found in some LED lamps may pose a threat to the environment. If accumulated in rivers and lakes, it may poison aquatic organisms.

To this end, in response to related issues, China Lighting Network reporter interviewed Li Zili, secretary general of the Guangdong Provincial Lighting Society, to explore the deep-seated reasons why LED lighting white light was questioned to affect human health and LED lamps were questioned to bring heavy metal pollution.

LED Indoor lighting

What is the harm of LED white light to human eye health? In Li Zili's view, the above research results are only an appearance. He has made an in-depth interpretation of this research result from two aspects.

First of all, according to the international standard IEC62471:2006 "Photobiosafety of Lamps and Lamp Systems", 1 cataract mainly causes damage from 700nm-1400nm red light to infrared light and 290nm-325nm medium wavelength ultraviolet wave, generally called "infrared-induced cataract". "and "UV-induced cataract", but currently there is no infrared light in the LED for illumination and there is no ultraviolet band in the middle band; 2 photo-induced keratitis is mainly caused by short-wavelength of 200nm-320nm, medium-wave ultraviolet light, but currently used in LED lighting The absence of these ultraviolet rays; 3 retinal hazards mainly caused by 400-500 nm blue photochemical damage, and 400 nm to 1100 nm visible-to-infrared thermal damage of the retina, but the main role of thermal damage of the retina must be less than 10 seconds to produce a human eye. High-temperature high-power lamps are illuminated. At present, there is basically no infrared light in the LEDs for lighting, and there is basically no high-power LED lamps for close-range use. It can be seen that there is almost no ultraviolet light or infrared light in the LED lamps currently used for illumination, and the harm of LED white light to the human eye is mainly reflected in the "blue light" aspect.

However, many traditional lighting products, such as high-end lighting and high-power metal halide lamps used in shopping malls and stadiums, have both high-power infrared heat and "blue light", as well as "long-wave, medium-wave, and even short-wave ultraviolet rays." Even the incandescent lamps that people are most accustomed to have a large amount of infrared rays, a small amount of ultraviolet rays and blue light. White light can be decomposed into red orange, yellow, green, blue, and purple. It can also be composed of red, green, and blue primary colors. Therefore, blue light is inevitably present in all lighting products.

Secondly, there are a large number of high-intensity infrared rays, ultraviolet rays and blue light in the sunlight. The sun is very strong, and its ground illumination is about a hundred times that of people's reading illuminance specifications. The blue light in the sun is the largest in its spectral power. Therefore, it is not necessary to talk about the blue light retina damage of LED white light to the human eye. After years of controversy and improvement, there is basically no risk of reaching the second class RG2 LED lamps. This kind of RG2 lamps are long-distance direct-view lamps at a long distance. It's perfectly fine, and it will damage the retina when it is close to the light for a long time. In contrast, people who look up directly at the noon sun for more than a second may have retinal damage. From this point of view, the risk of the sun reflected from the mirror surface of the building's curtain wall is relatively high (especially for children and young children who cannot avoid glare) because people do not need to look up too much and their eyes may look To strong reflected light. It can be seen that LED lighting and LED lighting are relatively safe.

In general, to solve the human eye health problems caused by LED white light, we can only return to find out how to suppress the blue light damage to the human eye.

LED lamps can not be "full" responsibility for heavy metal pollution

For LED lamps that are suspected of causing heavy metal pollution, Li Zili believes that not only LED lamps contain heavy metal elements. Many daily consumer products or their production processes use a lot of heavy metal elements such as nickel and copper. In the past, traditional lighting products also used heavy metal elements such as nickel and copper. For example, fluorescent wires have a large number of conductive wires in the fluorescent lamp. A large number of light sources are copper-plated, copper-plated iron wire, nickel-plated copper wire, nickel-plated iron wire, nickel-plated iron wire, etc. Most of the E27 and E14 lamp caps of energy-saving lamps are made of heavy metal nickel such as iron-plated nickel.

At the same time, Li Zili also pointed out that it is not a good thing to use these heavy metal materials in the LED containment and production process. Nickel is the most common contact allergic metal. Therefore, to reduce the harm of nickel and other heavy metals to the human body and the environment, In the process of dismantling and recycling LED products, it is necessary to do the corresponding environmental protection work.

Why LED lights are repeatedly questioned

White light is a common light. Traditional fluorescent tubes and energy-saving lamps are also white lighting, but they are not very prominent for the health problems of the human eye. Why do LED lamps have such a big impact on human eye health? Even with the heavy metal pollution that many traditional lighting fixtures have, LED lamps will be “snapped out” in this respect. In response to the above questions, Li Zili believes that there are The following reasons:

1) The advantages of LED lighting compared to traditional lighting are very obvious, but compared with traditional lighting products, LED still has some defects. For example, 1LED has a small light-emitting area. In the early days, many LED lamps did not undergo diffused light processing, resulting in high brightness and glare; 2 LED luminosity and chromaticity spatial distribution were uneven, resulting in uneven light and color of the illuminated surface; 3 even in the same color gamut 2 LEDs, for example, even if they meet the standard requirements in the 7-step color gamut, but the color difference between them may be obvious; in traditional lighting products, except for metal halide lamps, other lights do not appear; 4 At the same color temperature, theoretically and practically, LEDs are at a greater risk than blue light hazards of traditional lighting products. Especially in the early stage of LED development, LED has low light efficiency and high price. Many LED lighting products use high color temperature LED light-emitting diodes with higher light efficiency than low color temperature LEDs, which is another reason for high brightness and glare.

2) Human cognition and adaptability. The advantages of LED lighting compared with traditional lighting are very obvious, and the technology is developing very fast. The process of replacing traditional lighting with LED lighting is very fast. The difference between LED lighting and traditional lighting does make some people feel uncomfortable for a short time, especially in the early stage of LED lighting development. But after a while, most people have become accustomed to adapting.

3) Because traditional lighting is not a high-level industry, but it involves a lot of people, it is not very concerned by the technical staff. Most of the experts engaged in high-tech do not have the practical experience of traditional lighting, and the technicians engaged in traditional lighting also recognize the LED. Insufficient knowledge, both of which make it difficult to fully and accurately compare LEDs with traditional lighting, and it is difficult to fully understand the shortcomings of LEDs.

4) The early development of LED is still not in place. For example, the most important light efficiency indicators can not reflect higher than traditional lighting. Some of the LED lighting trends are not well understood. Some traditional lighting companies that are in a wait-and-see state may be in their own interests. Various occasions have made some comments that are not conducive to LED, which has produced a profound misleading to the public. At the same time, because there are no standards for initial LEDs, it is quite confusing. Many LED lighting products do have many problems.

Based on the above interpretation, LEDs are indispensable for the lighting industry and society. However, Li Zili also pointed out that the human health problems that may be induced by LED lighting are not exclusive. The traditional lighting industry and products also exist, and some even more serious. With the advancement of LED lighting technology, all problems will be solved.