HIGH-PRESSURE MERCURY LAMP

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PROBLEM TO BE SOLVED : To provide a lamp structure attaining higher efficiency not realized with a lamp of a conventional structure, and free from a problem of short life or the like.SOLUTION : In the high-pressure mercury lamp with a reflector provided with an arc tube 1 with rare gas sealed at least together with mercury and halogen in a tube equipped with a pair of electrodes, a cross-section shape of the arc tube crossing a light axis direction of the lamp is to be an elliptical shape of nearly a uniform thickness, and the arc tube is made of a quartz glass tube of an elliptical cross section, with its long-axis direction arranged so as to be in a vertical direction at horizontal lighting of the lamp.COPYRIGHT : (C)2009, JPO&INPIT