A often overlooked advantage of LEDs

Most people now know that LED is a new source of energy saving. But there is still a big advantage that is often overlooked, that is, pollution-free and environmentally friendly.

We know that mercury is an extremely toxic substance. However, most of the high-efficiency electric light sources currently used contain mercury. The mercury content of various electric light sources is shown in the following table:

26mm fluorescent lamp

Metal halide lamp

HPS Energy saving lamp (10mm) Various LEDs



10-15mg 0

Mercury has a very low boiling point and can evaporate at normal temperatures. After a waste discarded light source is broken, it immediately emits mercury vapor to the surrounding area, which instantly makes the concentration of mercury in the surrounding air reach 10-20 mg/m3, exceeding the maximum allowable concentration of mercury in the air (0.01 mg/cubic). M) is 1000 to 2000 times. According to a study of mercury at Stanford University in the United States, 1 milligram of mercury is enough to contaminate 5454.5 kilograms of drinking water, making it impossible to meet safe drinking standards. The consequences of air and water pollution caused by mercury are very serious. After being eaten by aquatic organisms, CH3Hg is produced. This is a highly toxic substance, as long as the half ear spoon can cause death. Mercury itself destroys the central nervous system, and the effects of reproductive defects are also very serious. Mercury can also damage the kidneys and liver, and can even cause death at a sufficient dose. Mercury can be transferred in different ways in the soil, in the water stream, and even in the atmosphere and food chain. Therefore, persistence, easy migration and high bioaccumulation make mercury one of the most attractive environmental pollutants in the world. The most serious mercury poisoning incident in history was the case of Japan's Minamata disease, when hundreds of people died as water in Minamata was contaminated with mercury. Now the Japanese government has learned the lesson that all discarded fluorescent lamps must be treated with toxic substances, so that those who purchase ordinary fluorescent lamps must pay twice as much to pay for this toxic substance disposal fee.

Recently, the Chinese government has distributed 100 million energy-saving lamps free of charge. Although the mercury content of special low-mercury energy-saving lamps can be reduced to less than 5 mg (I don’t know if the Chinese government issued such low-mercury energy-saving lamps), Nor does it reduce its hazard, because one such low-mercury energy-saving lamp contains enough mercury to contaminate 27.27 tons of drinking water. And 100 million energy-saving lamps are enough to pollute 2.7 billion tons of water, which is equivalent to the drinking water of the people of the country for several years.

Because China does not have a special recycling agency and recycling regulations, most fluorescent lamps and energy-saving lamps are buried like ordinary garbage. Regardless of whether fluorescent lamps or energy-saving lamps are made of extremely fragile glass, the mercury must be Will run out, and because of the high proportion of mercury, it is easy to sink and penetrate into the groundwater, and then be consumed by humans and animals. The consequences are unimaginable. In particular, the vast majority of the people are almost ignorant of the dangers of mercury.

In addition, all electric light sources that use mercury vapor to emit light use electrons to bombard mercury vapor to generate ultraviolet light. This ultraviolet light is also an environmental pollution. Its main wavelength is 2537 angstroms = 2537x10-10m = 253.7nm, which is called UV-C ultraviolet ray. About 60% of the energy consumed can be converted to ultraviolet light, and other energy (about 40%) is converted to heat. The visible light is released by the ultraviolet light absorbed by the fluorescent material on the inner surface of the tube. Different phosphors emit different visible light. The efficiency of converting "ultraviolet light" to "visible light" is about 40%. Therefore, the efficiency of the fluorescent lamp is about 60% x 40% = 24%, which is about three to five times that of the same power tungsten wire. That is to say, 100%-(40% + 24%)=36% of the ultraviolet rays are not converted into other energy and directly radiate on the glass tube wall. 36% of the UV rays are about 94% exhausted through the wall of the glass tube, so 36% x6% = 2.16% of UV-C may pass through the glass tube. UV-C is considered to be Deep UV on the human body, which is extremely harmful. The US GE Singular Company recommends that humans should not be exposed to fluorescent light for more than 16 hours. The damage caused by ultraviolet rays to the human body is the total amount accumulated for life. This is crucial for those girls who love beauty.

Not only that, but also energy-saving lamps and fluorescent lamps. A Taiwanese scholar measured the microwave radiation of his home energy-saving lamps. The results are as follows. When the lamp is not turned on, the microwave radiation measured in the room is 0.011 microwatts per square centimeter (0.011 μW/cm 2 ) in the range of 0.5-3 GHz. After opening a 60 W incandescent lamp, the microwave value is obtained. The same; after changing to a 15W energy-saving lamp, the microwave value is as high as 50 microwatts per square centimeter (50μW/cm2), which is 5000 times that of incandescent lamps. It is replaced by a 26W energy-saving lamp with a microwave radiation value of 100 microwatts per square centimeter (100μW/cm2), which is 10,000 times that of incandescent lamps, almost higher than that of mobile phones. The national microwave hygiene standard is 50 microwatts/cm2, so it has exceeded the national microwave hygiene standards. The electromagnetic wave intensity of the 15-watt energy-saving lamp is about 70 milligauss, and the electromagnetic wave intensity of the 26-watt energy-saving lamp is 80 milligauss. The 60-watt incandescent lamp is almost zero. Because the mechanism of the fluorescent lamp and the energy-saving lamp are exactly the same, the microwave radiation of the fluorescent lamp is only higher than that of the energy-saving lamp, and never lower than the energy-saving lamp. And this kind of microwave radiation can cause a feeling of dizziness. It is not known as to what diseases will be caused. Japanese studies have shown that people who work long hours in front of a computer have twice the probability of getting glaucoma than others. It is important to know that a computer's liquid crystal display is also backlit with a cold cathode fluorescent lamp similar to a fluorescent lamp.

The LED lamp is a completely environmentally friendly product that is completely free of mercury, and it does not have ultraviolet radiation, but its driving power source has extremely low microwave radiation. The use of this new light source completely eliminates all kinds of pollution, so it can be called a true "green light source". (Edit: Looking up at the stars)

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