High pressure sodium vapor discharge lamp

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

H - Electricity

01

J

313/84

H01J 61/40 (2006.01) H01J 61/38 (2006.01)

Patent

CA 1064566

HIGH PRESSURE SODIUM VAPOR DISCHARGE LAMP Abstract of the Disclosure The specification discloses a high pressure sodium vapor discharge lamp comprising an alumina tube envelope containing sodium, an inert starting gas, a mercury or cadmium buffer gas source and a pair of discharge electrodes. The inner diameter d in mm of the tubular envelope and the average potential gradient E in volt/cm has the following relationship: E ? 37.7-2.05d. The lamp further comprises a radiation suppressing means at least partially surrounding the tube envelope for selectively, and at least partially, absorbing red radiation having wavelengths longer than 620 nm. The lamp achieves a higher color temperature and a higher general color rendering index than conventional lamps of this type without an undesirable increase in the tube voltage, and is suitable for highly efficient indoor illumination.

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