It is a gas discharge lamp which uses mercury in excited
states.
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Disadvantages of sodium vapour discharge lamp
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A fluorescent lamp refers to a low pressure mercury-vapor
gas-discharge lamp that uses fluorescence in order to produce
visible light. It is also called a fluorescent tube.
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T12 lamp ordinarily known as fluorescent lamp or fluorescent
tube refers to a gas-discharge lamp that uses electricity to excite
vapor. T12 lamp is available in different colors such as light
blue, violet, green and red.