Metal halide discharge lamp with improved shank loading factor

Details Metal halide discharge lamp with improved shank loading factor Metal halide discharge lamp with improved shank loading factor

1990-12-31

1992-05-26

Yusko, Donald J.

Electric lamp and discharge devices

With gas or vapor

Envelope with particular structure

313284, 313285, 313631, 313632, 313 44, 313 46, H01J 1716, H01J 6130

Patent

active

051171546

ABSTRACT:
A low-wattage metal-halide discharge lamp has a quartz tube of the double-ended type that forms a bulb or envelope, a pair of electrodes, e.g., an anode and a cathode, which penetrate into an arc chamber inside the envelope, and a suitable amount of mercury plus one or more metal halide salts. The electrodes are each formed of a refractory metal, i.e., tungsten wire, extending through the respective necks into the arc chamber. Heat dissipation through the neck is controlled by constructing the quartz shanks to that they have shank segments of a desired surface area that extend from the necks a distance equal to the length of the arc chamber. A shank segment loading factor defined as the rated power divided by the shank segment surface areas, and should be in a target range of 12 to 36 w cm.sup.-2. Lamps of this design achieve high efficacy at relatively low power, i.e., below 30 watts.

REFERENCES:
patent: 3263852 (1966-08-01), Fridrich
patent: 3305289 (1967-02-01), Fridrich
patent: 3636341 (1972-01-01), Miller
patent: 3714493 (1973-01-01), Fridrich
patent: 4202999 (1980-05-01), Holle et al.
patent: 4968916 (1990-11-01), Davenport et al.

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