Metal-halide lamp having heat redistribution means

Details Metal-halide lamp having heat redistribution means Metal-halide lamp having heat redistribution means

1987-05-07

1988-12-13

Moore, David K.

Electric lamp and discharge devices

With temperature modifier

Double wall, jacket or casing for envelope

313 27, 313634, H01J 6134, H01J, H01J

Patent

active

047913347

ABSTRACT:
An improved metal-halide arc discharge lamp includes an arc tube having a substantially cylindrical body surrounded laterally by a substantially cylindrical heat-conserving sleeve within an evacuated outer envelope. The ratio of the outer radius of the arc tube divided by the inner radius of the sleeve falls within an optimum range of approximately 0.54 to approximately 0.68, and preferably within a range of approximately 0.60 to approximately 0.63. A lamp constructed in accordance with the invention exhibits improved luminous efficacy and color rendering in comparison to prior art counterparts. The improved performance is believed to be attributable to the more nearly isothermal operation of the arc tube for a given wall loading.

REFERENCES:
patent: 3234421 (1966-02-01), Reiling
patent: 4321504 (1982-03-01), Keeffe et al.
patent: 4499396 (1985-02-01), Fohl et al.

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