HIGH-PRESSURE DISCHARGE LAMP, HIGH-PRESSURE DISCHARGE LAMP LIGHTING SYSTEM AND LIGHTING EQUIPMENT

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Disclosed is a high-pressure discharge lamp includes a translucent ceramics sealed container provided with an enclosed part with a discharge space formed therein, a pair of electrodes disposed inside of both end parts of the translucent sealed container, an ionization medium having a structure containing a metal halide that primarily emits light, a starting gas and substantially no mercury, the metal halide that primarily emits light including 30% by mass or more of a halide of at least one lanthanoid type rare earth metal and the starting gas having a pressure P (atm) satisfying the equation, 1≦P≦20, the ionization medium being sealed in the translucent ceramics sealed container, wherein the ratio D/G satisfies the equation, 0.3≦D/G≦2.4 when the maximum inside diameter of the translucent ceramics sealed container is D and the inter-electrode distance is G.