Gas discharge lamps can be divided into:
1. Low-pressure discharge lamp: fluorescent lamp (low-pressure mercury lamp), low-pressure sodium lamp, electrodeless lamp
2. High-intensity gas discharge lamp: fluorescent high-pressure mercury lamp, high-pressure sodium lamp, metal halide lamp, ceramic metal halide lamp
Among them, fluorescent lamps are the most widely used gas discharge sources. It has the advantages of simple structure, high luminous efficiency, soft illumination and long life. Fluorescent lamps are 4-5 times more efficient than incandescent lamps and 3-8 times longer than incandescent lamps. They are energy efficient light sources.
High-intensity gas discharge lamp: A light-emitting arc is established due to the wall temperature of the tube, and the surface of the light-emitting tube is loaded with a discharge lamp exceeding 3 W/cm2. Such as high pressure mercury lamp, high pressure sodium lamp, metal halide lamp and so on.
Among them, the metal halide lamp is a new high-efficiency light source developed on the basis of the working principle of the high-pressure mercury lamp and the tungsten halogen lamp. The basic principle is to add a plurality of metal halides into the arc tube of the high-pressure mercury lamp, so that These metal atoms emit electrons like mercury and emit light. Filled with different metal halides, it can be made into light sources with different characteristics.
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