discharge lamp

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 to whether the light is mainly produced in a gas or in a metal vapour, one distinguishes between gas discharge lamps, for example xenon, neon, helium, nitrogen, carbon dioxide lamps, and metal vapour lamps, such as mercury vapour and sodium vapour lamps.

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