High color rendering calcium-containing metal halide lamp

Details High color rendering calcium-containing metal halide lamp High color rendering calcium-containing metal halide lamp

1986-10-20

1988-05-03

Moore, David K.

Electric lamp and discharge devices

With gas or vapor

Having specified electrode spacing

313621, 313634, 313638, H01J 61073, H01J 6118, H01J 6130

Patent

active

047422688

ABSTRACT:
A metal halide lamp provides exceptional color rendition because of a high calcium iodide partial pressure. A long-arc ellipsoidal arc tube provides a high "cold spot" temperature. The method of manufacture of the lamp includes heating the arc tube tubulation while burning the lamp after dosing, and then an evacuation step to eliminate moisture due to the hygroscopic calcium iodide.

REFERENCES:
patent: 4161672 (1979-07-01), Cap et al.
patent: 4594529 (1986-06-01), de Vrijer

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