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How energy-saving lamps work

Update:28 Feb 2020

The scientific name of energy-saving lamps is compact t […]

The scientific name of energy-saving lamps is compact three-primary-color electronic fluorescent lamps (CFL lamps for short). It was first invented by foreign manufacturers in 1978. Because of its high light efficiency (5 times that of ordinary light bulbs), it has a significant energy-saving effect and a long life (it is ordinary 8 times the light bulb), small size, easy to use, etc., have been valued and welcomed by people and countries in China. In 1982, China first developed the SL compact fluorescent lamp at the Institute of Electric Light Sources of Fudan University. With rapid growth and steady improvement in quality, the country has adopted it as a national energy-saving product (green lighting product) for development and promotion.

The working principle of energy-saving lamps is to heat the filament of the lamp through a ballast. At about 1160K, the filament starts to emit electrons (because some electron powder is coated on the filament). The electrons collide with the argon atom to produce an inelastic collision. The argon atom The energy obtained after the collision collides with the mercury atom. After absorbing the energy, the mercury atom transitions and generates ionization, which emits 253.7nm ultraviolet rays.

The ultraviolet rays excite the phosphor to emit light. Because the temperature of the filament during the operation of the fluorescent lamp is about 1160K, which is 2200K higher than the incandescent lamp -2700K is much lower, so its life is greatly improved, reaching more than 5000 hours. Because it does not have the current heating effect like incandescent lamps, the energy conversion efficiency of phosphor is also very high, reaching more than 60 lumens per watt.