high pressure mercury (vapour) lamp

high intensity discharge lamp in which the major portion of the light is produced, directly or indirectly, by radiation from mercury operating at a partial pressure in excess of 100 kPa

NOTE This terms covers clear, phosphor coated (mercury fluorescent) and blended lamps. In fluorescent mercury discharge lamp, the light is produced partly by the mercury vapour and partly by a layer of phosphors excited by the ultraviolet radiation of the discharge.

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