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Why can LED lamps save energy?

LED is a light-emitting diode made of semiconductor materials, which directly converts electric energy into light energy. Its electro-optic efficiency is very high
The basic working principle of energy-saving lamp is the same as that of fluorescent lamp, except that the ballast is changed into electronic and integrated with the lamp tube. Although it is more energy-saving than incandescent lamp, it is lower than the electro-optic conversion efficiency of LED, and the service life of lamp tube is not as long as LED
Incidentally, although the external voltage of the energy-saving lamp is 220V AC, in fact, its working voltage is much lower. In the rectifier, it is necessary to rectify and reduce the voltage into a lower DC, and then convert it into a high-frequency AC driving the lamp. The reason why the external 220V AC is completely convenient for people's daily use, because in our country, the household power supply is 220V AC