High pressure sodium lamp having improved pressure stability

Details High pressure sodium lamp having improved pressure stability High pressure sodium lamp having improved pressure stability

1985-02-04

1986-10-14

Barr, Josephine L.

Electric lamp and discharge devices

With gas or vapor

Having electrode of alkali, alkaline or rare earth material

252521, 313633, 313346R, H01J 1704, H01B 106

Patent

active

046174923

ABSTRACT:
High pressure sodium lamps have been subject to progressive reduction in pressure of contained sodium with attendant reduction in lighting quality. It has been discovered that modification of lamp components permits the pressure of contained sodium to be maintained at higher levels. Emission materials enclosed within the lamp are altered to limit reactive oxygen in the lamp atmosphere. A thermionic electrode as equipped with an improved emission composition as illustrated in areas B and C of the triaxial plot of FIG. 3.

REFERENCES:
patent: 3453477 (1969-07-01), Hanneman et al.
patent: 3708710 (1973-01-01), Snyser et al.
patent: 4052641 (1977-10-01), Dominick et al.
patent: 4155758 (1979-05-01), Evans et al.
patent: 4251569 (1981-02-01), Mager et al.
patent: 4313854 (1982-02-01), Sunahara et al.
patent: 4319158 (1982-03-01), Watambe et al.
patent: 4468586 (1984-08-01), Hohn

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