METAL HALIDEE LAMP, LIGHTING DEVICE FOR METAL HALIDE LAMP AND HEADLIGHT

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A mercury-free metal halide lamp which is improved in light flux rising immediately after starting, more practical, and suitable for a headlight, and a metal halide lamp lighting device and a headlight using this. The metal halide lamp comprises a translucent air-tight container having an inner volume of up to 0.1cc, being provided with an enclosure formed with an inner space having a flat surface on the bottom surface, and satisfying an expression, 0.29 <= D/L <= 0.43 when the distance between the bottom surface and the top surface at the tube-axis-direction middle portion of the inner space is D and the length of the enclosure is L, a pairof electrodes sealed facing each other with an inter-electrode distance of up to 5mm, and a discharging medium containing a plurality of metal halogen compounds selected from a group of Sc, Na, In, Zn and a rear-earth metal and a rear gas but intrinsically not containing mercury (Hg), wherein a lamp power per unit inner surface area of the air-tight container is at least 60(W/cm2).? KIPO & WIPO 2007