Metal halide arc discharge lamp having short arc length

Details Metal halide arc discharge lamp having short arc length Metal halide arc discharge lamp having short arc length

1992-10-23

1994-08-02

O'Shea, Sandra L.

Electric lamp and discharge devices

With temperature modifier

Double wall, jacket or casing for envelope

313620, H01J 6134, H01J 1716

Patent

active

053349067

ABSTRACT:
A metal halide arc discharge lamp includes a sealed light-transmissive outer jacket, a light-transmissive shroud located within the outer jacket and an arc tube assembly located within the shroud. The arc tube assembly includes an arc tube, electrodes mounted within the arc tube and a fill material for supporting an arc discharge. The electrodes have a spacing such that an electric field in a range of about 60 to 95 volts per centimeter is established between the electrodes. The diameter of the arc tube and the spacing of the electrodes are selected to provide an arc having an arc diameter to arc length ratio in a range of about 1.6 to 1.8. The fill material includes mercury, sodium iodide, scandium tri-iodide and a rare gas, and may include lithium iodide. The lamp exhibits a high color rendering index, high lumen output and high color temperature.

REFERENCES:
patent: 3897594 (1975-07-01), Popp et al.
patent: 4929863 (1990-05-01), Verbeek et al.
patent: 5144201 (1992-09-01), Graham et al.

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