The only way to reduce the temperature and lower the temperature of the filament can achieve the purpose of prolonging life. When the working temperature of tungsten wire is as high as 2700 °C, the lamp will be extinguished in less than 1 hour; the working temperature of tungsten wire will drop to 1700 °C, and the service life can be extended to more than 1000 hours.
However, this is not a good idea. Reducing the operating temperature of the tungsten wire, that is, reducing its incandescence, will reduce the luminous efficiency of the incandescent lamp, far less bright than when the temperature is high.
Therefore, the problem is clearly placed in front of people: if the incandescent lamp is more radiant, it has to increase the working temperature of the filament; to reduce the evaporation of the tungsten wire to extend the life of the lamp, it is necessary to lower it. One body is warm. This is contradictory.
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