METAL HALIDE LAMP AND ILLUMINATOR EMPLOYING IT

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A metal halide lamp comprises a translucent air right vessel (1) having an arc tube section (11) forming a discharge space (13) and sealing portions (121, 122) formed at the both ends thereof, a discharge medium with which the discharge space is filled, and a pair of electrodes (31, 32) projecting into the discharge space. The discharge medium is composed of a metal halide and rare gas and essentially containing no mercury. The pair of the electrodes is composed of tungsten containing thorium oxide. Protrusions (311, 312) are formed respectively, on the pair of electrodes and arc is formed between them when the metal halide lamp is operated.