Electric light sources can be generally divided into two categories: illumination sources and radiation sources. The illumination source is an electric light source for the purpose of illumination, which radiates a visible spectrum (wavelength 380-780 nm) mainly for human vision. Its specifications range from 0.1 watt to 20 kW, and the output accounts for 95% of the total output of the electric light source. the above. The radiation source is an electric light source that can radiate a large amount of ultraviolet spectrum (1 to 380 nm) and infrared spectrum (780 to 1 x 106 nm) for illumination purposes, and includes an ultraviolet light source, an infrared light source, and a visible light source for non-illumination. The above two types of light sources are all incoherent light sources. In addition, there is a kind of coherent light source, which emits light under the action of excited radiation by excited state particles, and the output light wave wavelength is from short-wave ultraviolet to far-infrared. This kind of light source is called laser light source. There are many kinds of illumination sources for electric light source bases, which are divided into three categories: heat radiation source, gas discharge source and electroluminescence source according to the form of illumination. 1 Thermal radiation source. A current that flows through a conductive object to radiate light energy at high temperatures. Including incandescent and tungsten halogen lamps. 2 gas discharge light source. A current source flows through a gas or metal vapor to produce a light source that emits light and emits light. There are two kinds of gas discharges: arc discharge and glow discharge. The discharge voltage has three kinds of low pressure, high pressure and super high pressure. The arc discharge light source includes: a low-pressure gas discharge lamp such as a fluorescent lamp, a low-pressure sodium lamp, a high-intensity mercury discharge lamp such as a high-pressure mercury lamp, a high-pressure sodium lamp, a metal halide lamp, an ultra-high pressure gas discharge lamp such as an ultra-high pressure mercury lamp, and a carbon arc lamp. A gas discharge lamp with a large discharge pressure span such as a xenon lamp and some spectral light sources. The glow discharge source includes a glow indicating light source utilizing glow discharge in the negative glow region and a neon lamp utilizing glow discharge in the positive pillar region, both of which are low pressure discharge lamps; in addition, some spectral light sources are included. 3 electroluminescent light source. A light source that illuminates a solid substance under the action of an electric field. It converts electrical energy directly into light energy. It includes two kinds of electroluminescent light sources and light-emitting diodes. Reducing Flange Dimensions,Carbon Steel Pipe Fitting,Weld Neck Reducing Flange,Din Flanges Jimeng Highstrength Flang-Tubes Group Co., Ltd. , http://www.jmpipefitting.com