Metal halide lamp having CO in gas fill

Electric lamp and discharge devices – With temperature modifier – Double wall – jacket or casing for envelope

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313571, 313639, H01J 6112, H01J 6120

Patent

active

051592290

ABSTRACT:
A metal halide high intensity discharge lamp including a carbon monoxide additive in the arc tube fill to improve lumen maintenance is provided. The metal halide discharge lamp of the present invention comprises: an outer sealed glass envelope; a pair of electrical conductors sealed into and passing through the glass envelope; an arc tube disposed within the outer glass envelope, the arc tube including a pair of spaced electrodes therein with the electrodes being electrically connected to the electrical conductors such that one electrode is electrically connected to one electrical conductor; a chemical fill disposed within the arc tube, the chemical fill comprising mercury, metal halide additives, carbon monoxide, and a starting gas; and a support structure disposed within the outer glass envelope to support the arc tube therein.

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patent: 3364376 (1968-01-01), Collins et al.
patent: 3728572 (1973-04-01), Maier et al.
patent: 4163171 (1979-07-01), Wurster
patent: 4171498 (1979-10-01), Fromm et al.
patent: 4620125 (1986-10-01), Keeffe et al.
patent: 4625141 (1986-11-01), Keeffe et al.
patent: 4709184 (1987-11-01), Keeffe et al.
patent: 4791334 (1988-12-01), Keeffe et al.
patent: 5021703 (1991-06-01), Passmore

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