Metal halide lamp with improved field wire

Details Metal halide lamp with improved field wire Metal halide lamp with improved field wire

2005-09-27

2005-09-27

Williams, Joseph (Department: 2879)

Electric lamp and discharge devices

With temperature modifier

Double wall, jacket or casing for envelope

C313S623000

Reexamination Certificate

active

06949871

ABSTRACT:
An improved discharge lamp is provided which includes a discharge vessel (arc tube) enclosing a discharge space, the discharge vessel (arc tube) including within the discharge space a metal halide ionizable material; first and second discharge electrode feedthroughs, and first and second current conductors connected to the first and second discharge electrode feedthroughs, respectively. The improvement is through the use of a field wire of a material that includes Ni or Ni alloy, and wherein the field wire material exhibits an electrical resistivity at 25° C.<10 ohms/mm2; a photoelectric emission work function>4.0 eV; a thermionic emission work function>4.0 eV; and a melting point>1200° C.

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