Lighting source classification

Lighting source classification

There are many kinds of illumination sources, which are divided into three categories: thermal radiation source, gas discharge source and electroluminescence source according to the form of illumination.

1.heat 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 flows through a gas or metal vapor to produce a light source that emits gas 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 comprises: 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 that utilizes glow discharge in the negative glow region and a neon lamp that utilizes 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.