High-pressure sodium vapour discharge lamp

Details High-pressure sodium vapour discharge lamp High-pressure sodium vapour discharge lamp

H - Electricity

01

J

313/137

H01J 61/04 (2006.01) H01J 61/073 (2006.01) H01J 61/12 (2006.01) H01J 61/24 (2006.01)

Patent

CA 1163306

ABSTRACT: The invention relates to a high-pressure sodium vapour discharge lamp having a ceramic discharge vessel. In addition to sodium and possibly mercury the discharge vessel also comprises a rare gas. In the discharge vessel an electrode of a refractory metal is accommodated. In the operating condition of the lamp the discharge emanates from the tip of the electrode. According to the invention the electrode is free from alkaline earth metals and the elec- trode tip in the operating condition of the lamp has a temp- erature between 2400 K and 2700K. Disappearance of sodium caused by the electrode material is prevented in this manner.

385157

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