Metal halide lamp

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PROBLEM TO BE SOLVED : To provide a metal-halide lamp with excellent life characteristics with little melanization of an arc tube even with the use with a lamp power output within the range of 3.6 to 4.2 KW. ?SOLUTION : The metal-halide lamp is provided with a main electrode consisting of at least an electrode core and an electrode coil wound around the electrode core at each end of the arc tube. Mercury, rare gas and a halide of rare-earth metal are sealed in the arc tube, and the arc tube is held in an outer tube. Provided a distance between the center (S) of a tip part of the electrode core and a tapered part (9) at an end of the arc tube is F (mm), the structure is to satisfy a relation of : 15≤F≤D/2. ?COPYRIGHT : (C)2006, JPO&NCIPI ?