Metal halide lamp with reduced quartz devitrification comprising

Details Metal halide lamp with reduced quartz devitrification comprising Metal halide lamp with reduced quartz devitrification comprising

1996-03-01

1998-02-03

Patel, Ashok

Electric lamp and discharge devices

With gas or vapor

Having a particular total or partial pressure

313637, 313638, H01J 1720, H01J 6112, H01J 6118

Patent

active

057148392

ABSTRACT:
An arc tube for a high intensity discharge lamp. The arc tube has a hermetically sealed body formed from a vitreous material subject to devitrification, at least two oppositely disposed electrodes are sealed in the body. An are generating and sustaining medium is provided in the body and operates to produce visible light when an electric current is applied to the electrodes. The are tube has a given color rendering index, and at least a portion of the medium comprises a color correcting component of lithium iodide which contributes no only to the given color rendering index but which also acts as a devitrification agent. The improvement comprises an anti-devitrification component in the medium, the anti-devitrification component having a minimal detrimental effect on the given color rendering index while increasing the life of the are tube.

REFERENCES:
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patent: 3979624 (1976-09-01), Liu et al.
patent: 4678960 (1987-07-01), Reiling
patent: 4801846 (1989-01-01), Kramer et al.
patent: 4825127 (1989-04-01), Krasko et al.
patent: 5021703 (1991-06-01), Passmore et al.
patent: 5225733 (1993-07-01), Krasko
patent: 5225738 (1993-07-01), Ramaiah et al.
patent: 5363007 (1994-11-01), Fromm et al.

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