High-pressure sodium lamp

Details High-pressure sodium lamp High-pressure sodium lamp

1983-02-23

1986-12-02

DeMeo, Palmer C.

Electric lamp and discharge devices

With gas or vapor

Having a particular total or partial pressure

313642, H01J 1720, H01J 6120

Patent

active

046267433

ABSTRACT:
A high-pressure sodium vapor lamp, comprising a hermetically closed tube made of a translucent material of high thermal resistivity as alumina, at least two electrodes arranged in the tube, is filled with noble gas particularly xenon and with vapors of sodium and mercury and/or cadmium under pressure of saturated vapors at the temperature of operating. The quantity of the vapors of mercury and/or cadmium is in the range from 0.5 to 5.0 micromol for each centimeter of length of the discharge arc initiated between the electrodes. The high-pressure sodium lamp with the mentioned quantity of additives is assured a long lifetime of operation.

REFERENCES:
patent: 3521108 (1970-07-01), Hanneman
patent: 3898504 (1975-08-01), Akutsu et al.
patent: 4075530 (1978-02-01), Furukubo et al.
patent: 4341978 (1982-07-01), Thornton, Jr. et al.

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