LED light is superior to brightness and power saving
Lao Li, an electrician at Pengcheng decoration company in the city, said: "people often consider the brightness when choosing lamps. The brightness of LED lamps is generally more than twice that of energy-saving lamps. Incandescent lamps rank second, and energy-saving lamps are at the bottom. According to the calculation, incandescent lamp consumes 0.03652 kwh per hour; energy-saving lamp consumes 0.00814 kwh per hour; LED lamp consumes 0.00704 kwh per hour. " Ordinary families usually turn on the lights for 5-6 hours a day. If the lights are turned on for 6 hours a day and 0.6 yuan per kilowatt hour, a 40W incandescent lamp costs 47.98 yuan a year, while a 10W energy-saving lamp costs 10.69 yuan a year, and a 5W LED lamp costs 9.25 yuan a year. Obviously, the use of incandescent lamps is the most uneconomical. LED lamps are more expensive than energy-saving lamps, but electricity is cheaper
Many brands of LED lights and disorderly prices
I met Mr. Wang, a citizen who came to buy LED lamps in a lamp Market in the city. He told me that energy-saving lamps had been used at home before, but the life of energy-saving lamps was relatively short, and they often broke in less than a year, so he wanted to replace them with LED lamps. But Mr. Wang is a bit confused about which led light to buy: "there are too many brands and I don't know which one is good, and the price is also disorderly." The reporter visited the market and found that at present, there are various brands of LED lights. The seller just said that they were imported from the manufacturers in Guangdong and other places. They sold well in the local market and there was no problem with the quality. What's more confusing to consumers is that the prices of LED lights in the market vary greatly. For example, they are all 3-watt LED lights, some of which are priced at 10 yuan, some of which are sold at 50 yuan or higher.
There are many inferior lamps in the market
"There is a lot of knowledge about LED lights, but some businesses sell some inferior products to consumers while we still don't know much about them." The head of Jinhua mingchuang photoelectric Co., Ltd. told reporters that the quality of LED household lamps in the market is uneven because the state has not issued relevant authoritative standards. There are two kinds of LED lights, one can be used for lighting, the other can only be used as indicator lights. LED lights using the latter are very cheap to sell, but their luminosity is very easy to decay and will soon darken. There is no doubt that led lamps will become the mainstream of the lamp Market in the future. Now many manufacturers have seen its huge profit space and have produced LED lamps one after another. But the problem is that there is no national authoritative standard. Most of these lamps are produced by enterprises according to their own standards, and their quality is not as good as the publicity. Because consumers do not understand the mystery, they are easy to fall into the trap of businesses.

Although the cost performance of energy-saving lamp and LED lamp is almost the same in general, the student table lamp is better to use LED lamp for lighting. The incandescent lamp emits light through the thermal effect of tungsten filament. The working principle of the energy-saving lamp is the same as that of the fluorescent lamp. It emits ultraviolet light by heating the filament and colliding the argon atom and the mercury atom, and then the ultraviolet light excites the fluorescent powder to emit light. Therefore, the light produced by the energy-saving lamp has stroboscopic, and the energy-saving lamp with high-frequency flash will also produce electromagnetic radiation, which is easy to cause damage to children's eyes after long-term use. LED lamp is a kind of light-emitting device with semiconductor electronic effect and low-voltage DC constant current source. Therefore, experts suggest that students use LED lamp for table lamp lighting.