In daily life, bulbs, table lamps, ceiling lamps commonly used in indoor homes, industrial and mining lamps used at work, outdoor lawn lamps and other landscape lights may all be LED lights. LED lights are lighting fixtures made of light-emitting diodes. They are more energy-saving, environmentally friendly and have a longer service life than our common incandescent lamps and energy-saving lamps. According to CCTV Finance's "First Time" report, the white light of most LED lights currently on the market is made by covering an LED chip that emits blue light with a layer of yellow phosphor and mixing it to obtain white light. However, there are many reports that the blue light produced by LED lights can damage the human retina. In this regard, Yu Anqi, deputy director of the National Electric Light Source Quality Supervision and Inspection Center, said that the LED light-emitting point is extremely small and the intensity of light emitted per unit area is extremely bright. This is its characteristic. Because of this characteristic, if the blue light emitted is very strong, it may cause harm to the eyes if viewed directly. This is possible.
In fact, blue light is everywhere in our lives, such as LED lights, computer monitors, mobile phones, digital products, LCD screens, etc., all have the shadow of blue light, but some have more blue light and some have less. In fact, there is no need to be afraid of these. There is so much blue light around us. If it was harmful, we might have suffered from eye diseases. However, under what circumstances will blue light cause harm to human eyes? How harmful is it? Experts did experiments for us.
According to national standards, the danger of blue light to the retina is divided into four levels: first, no danger level, followed by Category 1 danger level, which is also low risk level, followed by Category 2 danger level, and finally Category 3, high risk level. Light can cause irreversible harm to the eyes in a matter of seconds. The so-called blue light hazard refers to the damage caused to human eyes in a short time or instant when the radiance of blue light reaches Category 2 or Category 3 hazard levels. So which hazard level do our commonly used LED lights belong to? The reporter came to the laboratory and mainly tested four samples, one is an LED spotlight, one is an LED light with a diffusion cover added, one is an LED light with the diffusion cover removed and driven at half power, and one is an LED light with the diffusion cover removed and driven at full power. After testing, LED spotlights and LED lights with diffusion covers are both non-hazardous.
The next thing the professionals will do is to test the blue light hazards of the LED lamp with the diffusion cover removed. After filling the LED lamp with full driving power, the reporter noticed that the engineer could no longer look directly at the light source when looking at the light. The test results of such strong blue light surprised everyone: looking directly at it for tens of seconds can damage the retina. The damage is irreversible, and in severe cases, the eyes may even go blind. Through blue light hazard tests at different brightnesses, engineers concluded that the amplitude of blue light for ordinary LED spotlights and LED lights with a diffusion cover is within the normal range and will not cause damage to the retina of the human eye. However, for LED lights without a diffusion cover and with a power greater than 1 watt, regardless of full power or half power, blue light will cause obvious damage to the eyes.
Expert tips: How to use LED lights rationally
So how should we use LED lights reasonably? Experts believe that during the day, higher lighting color temperatures can be used to enhance people's working mood and achieve higher work efficiency. At night, low color temperature lights should be used to give people physiological cues that they need to rest. Judging from the current test results, household LED lights on the market are basically harmless. To use LED lights correctly, do not look directly at the LED light and do not remove the diffusion cover. If the diffusion cover is damaged and leaks light, replace it in time. When consumers purchase, they should pay special attention to the packaging and choose those with a color temperature below 4000K, which is commonly referred to as warm light, with more red components and less blue components, just like the morning sun.
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