An incandescent lamp is a device that converts electrical energy into light to provide lighting. Its working principle is: electricity was first converted into the heat, the filament heated to a very high temperature (tungsten wire, melting point of more than 3000 ℃), this time the elements of the filament element of the nucleus of electrons will be excited, so that it to the higher energy of the outer transition, when the electron again When the low-energy electron layer transitions, the excess energy is released in the form of light. At the same time produce heat, spiral filament will continue to heat accumulation, making the filament temperature of 2000 ℃ or more, the filament in the incandescent state, like the red iron can be issued as the same light. The higher the temperature of the filament, the brighter the light emitted. It is called incandescent lamp.
1) high energy consumption: luminous efficiency is low, not conducive to energy conservation; heat generated 80%, light is only 20%.
2) Life is relatively short in general about 1000 hours
3) color single: its warm and yellow light, sometimes not necessarily popular. Easy to damage: glass products.