How to choose healthy LED products LED blue light can be seen everywhere

As early as 2002, the International Lighting Commission CIE developed a non-laser light safety standard. The International Electrotechnical Commission IEC and the China General Administration of Quality Supervision, Inspection and Quarantine also issued similar standards to clearly define the hazard level of blue light contained in optical radiation products. Among these optical radiation hazards, one applies to LEDs , that is, blue light hazards, which refers to photochemical effects caused by radiation from 400 nm to 500 nm. Briefly, excessive blue light penetrates the lens into the retina, causing the retinal pigment epithelial cells to die, causing macular degeneration, or contracting the lens to cause visual impairment such as myopia, which directly leads to damage to the retina.

The radiation limit for the six aspects of optical radiation products is specified in the IEC62471 standard established by the International Electrotechnical Commission. For LEDs, the most important is the radiance or irradiance limit that meets the blue light hazard. If the led light source or luminaire meets the low or no hazard radiation limit, it can be considered that the lighting fixture has no photobiohazard.

In fact, we need not talk about the mere mention of Blu-ray, Blu-ray is essential in life, mobile phones, computers, etc. have led screen Blu-ray radiation. The familiar sun light contains various shades of light in the visible range.

The US Department of Energy tests different light source products at the same color temperature: when the color temperature of the LED is the same as that of other conventional light sources, the overall energy in the blue light band is not higher than other conventional light sources, and the potential hazard value of blue light is not significantly different from other light sources. difference.

Yu Anqi, chairman of the Shanghai Lighting Society, also did the same thing, randomly sampling and analyzing 27 kinds of led products in the Chinese market, and concluded that the LED products purchased by the formal channels are in line with the national standard and international standards, and the blue light is harmless or low-harm. The radiation limit specified by the level.

Therefore, in general, when properly used, LED products purchased through regular channels will not cause harm to the human eye. Even when encountering uncomfortable glare, the potential danger of photobiohazard will be alleviated because the human eye has a natural defense mechanism such as blinking, turning, and pupil contraction.

Finally, regarding the purchase and application of LEDs, Xiao Bian draws attention to the following three points to better protect:

1. Low-brightness light blue light harms higher brightness light and is safer. (Low-brightness light sources include fluorescent lamps, powdered incandescent bulbs, and their LEDs instead of light sources, such as LED bracket lamps, led panel lamps, etc., the blue light hazard values ​​of these lamps are basically in the first category of non-hazard levels, and a few are in the second category. Hazard level; high-brightness light sources include transparent incandescent bulbs, tungsten halogen lamps, ceramic metal halide lamps and their LEDs instead of light sources, such as led spotlights . The blue light hazard values ​​of these lamps are basically in the second category of low-hazard levels.)

2. When the luminous flux is the same, the low color temperature light source is more safe than the blue light source.

3. In the following applications, LEDs should be used with caution to prevent blue light from harming the human eye: non-white light sources (such as blue LEDs); baby room applications: infants do not form a photoreactive reaction, when looking at bright light sources at close range, they may Injury to the retina; patients with skin diseases, diabetes, and eye diseases avoid high-brightness light conditions; other situations: such as deliberate direct view of the light source; damage to the diffuser plate causes the light source to be exposed.

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