Incandescent Lamp (Incandescent light bulb) is an electrical light source that heats the filament to an incandescent state and emits visible light through thermal radiation. Invented by American inventor Thomas Alva Edison in 1879. Since the production of carbon fiber (i.e. carbon filament) incandescent lamps, the luminous efficiency of incandescent lamps has been correspondingly improved through continuous improvement of filament materials, filament structure, and gas filling. In 1959, the United States developed halogen tungsten lamps with minimal volume and light attenuation based on incandescent lamps. The development trend of incandescent lamps is mainly to develop energy-saving bulbs. The structure and components of incandescent lamps with different purposes and requirements are not the same. Incandescent lamps have excellent light color and light collection performance, but due to their low light efficiency, they have gradually withdrawn from production and sales. Incandescent lamps are a type of thermal radiation light source with low energy conversion efficiency, with only 2% to 4% of electrical energy converted into light that can be felt by the eyes. However, incandescent lamps have the advantages of good color rendering, continuous spectrum, and convenient use, so they are still widely used. The filament temperature of a lit incandescent lamp can reach up to 3000 ℃. It is precisely because the hot filament produces light radiation that the electric lamp emits a bright light. Because at high temperatures, some tungsten atoms evaporate into gas and deposit on the glass surface of the bulb, causing the bulb to turn black. Therefore, incandescent lamps are created with a "big belly" appearance, in order to allow the deposited tungsten atoms to disperse on a larger surface
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