HIGH-PRESSURE DISCHARGE LAMP AND LIGHTING SYSTEM

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PROBLEM TO BE SOLVED : To provide a mercury-free high-pressure discharge lamp and a lighting system equipped with the same excellent in light control characteristics and light-emitting efficiency. SOLUTION : The high-pressure discharge lamp includes a translucent airtight ceramic vessel 1 equipped with an envelope part 1a with a discharge space 1c formed inside, a pair of electrodes 2 arranged inside both end parts of the same, and an ionized medium sealed inside a translucent airtight ceramic vessel mainly containing light-emitting metal halide as metal emitting light and start-up gas, of a structure intrinsically not containing mercury, of which, the metal halide mainly emitting light contains at least a kind of halide of a lanthanoid system rare-earth metal with a sealing ratio of 30% by mass and the start-up gas includes a pressure P (an atmospheric pressure) satisfying : 1≤P≤20. Provided a maximum inner diameter of the translucent airtight ceramic vessel is D, and an interval between the electrodes is G, a ratio D/G satisfies : 0.3≤D/G≤2.4. COPYRIGHT : (C)2010, JPO&INPIT