Metal halide lamp

Details Metal halide lamp Metal halide lamp

1992-01-07

1993-03-09

DeMeo, Palmer C.

Electric lamp and discharge devices

With temperature modifier

Double wall, jacket or casing for envelope

313639, H01J 6120, H01J 6122, H01J 6134

Patent

active

051928914

ABSTRACT:
A metal halide lamp comprises a glass tube defining a discharge space and a pair of electrodes provided in the glass tube for generating a discharge therebetween. The metal halide lamp has mercury and halogen fillings comprising bromine and iodine contained in the glass tube. The mol ratio of the bromine to the halogen fillings is 0.3 to 0.7. The metal halide lamp has metal reacting with the halogen and emitting light in the glass tube by the discharge. The metal comprises tin, sodium, thallium and indium. The tin contained in the glass tube is at the amount of 1 to 14 .mu..multidot.mol per 1 cc of discharge space. Each mol ratio of the amount of the sodium, the thallium and the indium to the amount of the tin is not less than 0.2, respectively. The lamp has a color temperature of more than 4000.degree. K. without sacrificing efficiency or color rendition.

REFERENCES:
patent: 3566178 (1971-02-01), Mori et al.
patent: 3882345 (1975-06-01), Kazek et al.
patent: 4001626 (1977-01-01), Drop et al.
patent: 4717852 (1988-01-01), Dobrusskin et al.

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