Definition: | lamp in which the light is produced, directly or indirectly, by an electric discharge through a gas, a metal vapour or a mixture of several gases and vapours
NOTE – According as the light is mainly produced in a gas or in a metal vapour, one distinguishes between gaseous discharge lamps, for example xenon, neon, helium, nitrogen, carbon dioxide lamp, and metal vapour lamps, such as the mercury vapour lamp and the sodium vapour lamp.
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