High-pressure sodium vapor discharge lamp

Details High-pressure sodium vapor discharge lamp High-pressure sodium vapor discharge lamp

1980-05-19

1983-02-15

Demeo, Palmer C.

Electric lamp and discharge devices

With support and/or spacing structure for electrode and/or...

For plural electrodes of discharge device

313213, 313229, H01J 61073, H01J 6122

Patent

active

043743390

ABSTRACT:
High-pressure sodium vapor discharge lamps having a color temperature of 2250 to 2750 K. and a color rendition index Ra of 60-85 emit light of a strongly reduced Ra already after approximately 2000 hours in operation. As compared with the life of normal, yellow high-pressure sodium vapor 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.times.10.sup.4 to 10.7.times.10.sup.4 Pa. The rare gas pressure in the discharge vessel at 300 K. is between 1333 and 1333.times.10.sup.2 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.

REFERENCES:
patent: 4052634 (1977-10-01), De Kok
patent: 4152619 (1979-05-01), Bhalla
patent: 4152620 (1979-05-01), Bhalla
patent: 4253037 (1981-02-01), Driessen et al.
patent: 4322654 (1982-03-01), Tielemans et al.

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