Metal halide lamp and temperature control system therefor

Details Metal halide lamp and temperature control system therefor Metal halide lamp and temperature control system therefor

1997-09-04

2000-07-04

O'Shea, Sandra

Electric lamp and discharge devices

With gas or vapor

Envelope with particular structure

313570, 313571, 313620, 313642, H01J 1716, H01J 6130, H01J 1720, H01J 6112

Patent

active

060843519

ABSTRACT:
In a metal halide lamp which includes a discharge tube (2) retaining a fill of mercury and at least one metal halide added as a luminous material, an energy density of the arc discharge portion (3) represented by a product E.times.j is in the range of 70.0.ltoreq.E.times.j.ltoreq.150.0 (VA/mm.sup.3) where E=V/d, j=I/S, assuming that I is a lamp current in amperes with a lamp voltage of V volts applied between the paired discharge electrodes in a stable lighting condition of the lamp and that each of the electrodes has a tip face (1a, 1a') of which a cut area in section is S mm.sup.2 and the gap distance is d in millimeters, and thus a high luminous flux retention rate and high luminance of an arc discharge portion can be accomplished with a longer life of the lamp, suppressing a lamp voltage varying rate, and avoiding a change in color temperature, which remarkably improves additional merits when in utilization as a light source in various display apparatuses such as optical projection systems.

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