High pressure sodium lamp having improved efficacy

Details High pressure sodium lamp having improved efficacy High pressure sodium lamp having improved efficacy

H - Electricity

01

J

313/137

H01J 61/30 (2006.01) H01J 61/82 (2006.01)

Patent

CA 1203559

ABSTRACT OF THE DISCLOSURE The efficacy of a high pressure sodium arc discharge lamp is increased by reducing the wall loading and/or current density of the arc tube. Adequate arc tube wall temperature of at least about 1100°C is maintained by the use of radiant or thermal insulation or infrared reflection films or by the use of an arc tube material having a low thermal radiant emittance. The lamp is constructed from a non-vitreous arc tube having electrodes sealed into its ends. A metal framework provides support for the arc tube and an electrical path to the upper electrode.

377021

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