Gaseous Discharge lamp
The incandescent lamps suffer from two drawbacks-low efficiency and colour light. The gaseous discharge lamps have been developed to overcome these drawbacks. Discharge lamps are of two types;
(i) the lamps which give the light of the same colour as produced by the discharge through the gas or vapour such as sodium vapour, mercury vapour and neon gas lamps.
(ii) the lamps which use the phenomenon of fluorescence and are known as fluorescent lamps. In these lamps, the discharge through the vapour produces ultra-violet waves which cause fluorescence in certain materials called the phosphors. The inside of the fluorescent lamp is coated with a phosphor which absorbs ultra-violet rays and radiates visible rays. Example is fluorescent mercury-vapour tube.
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