High-pressure sodium vapour discharge lamp

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

H - Electricity

01

J

313/10, 313/113

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

Patent

CA 1150757

1 PHN 9472C ABSTRACT: High-pressure sodium vapour discharge lamps having a colour temperature of 2250 to 2750 K and a colour rendition index Ra of 60-85 emit light of a strongly reduced Ra already after approximately 2000 hours in oper- ation. As compared with the life of normal, yellow high- pressure sodium vapour discharge lamps, this period is very short. The discharge vessel contains sodium, mercury and a rare gas, the weight ratio Na/Hg being from 1/1 to 1/9 and the sodium pressure during operation of the lamp being from 4 x 104 to 10.7 x 104 Pa. The rare gas pressure in the discharge vessel at 300K is between 1333 and 1333 x 102 Pa. By using an emitter which contains oxygen-bound strontium and oxygen-bound tungsten in a molar ratio from 3/1 to 50/1, the initial properties of such white-light-producing lamps are maintained for a long period of time.

352539

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