Characters of light generating
The world of lamps can be divided into thermal radiators and luminescence radiators.
Thermal radiations
Incandescent lamps and tungsten-halogen lamps are Thermal radiators. When a tungsten filament enclosed in a bulb filled with gas is heated by passing electricity through it, these lamps emit a spectrum that is similar to that of the Black body radiator.
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Discharge lamps
In discharge lamps, light is generated when an electrical current is passed through gas or metal vapour plasma in sealed discharge tubes.
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Luminescent emitters
All light radiation that is not based on the temperature of a solid body is called Luminescence Radiation. Luminescence radiation is produced when electrons move from one energy level to another.
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