| 简介 |
PROBLEM TO BE SOLVED : To provide a metal halide lamp for an automobile head lamp, which contains much halide formed of a rare earth element with a low vapor pressure (a high melting point), and which exhibits an excellent light emission color maintaining property and excellent luminous efficiency.
SOLUTION : The metal halide lamp comprises a quartz glass arc tube having electrode sealing parts at both ends, a pair of electrodes arranged inside the arc tube through the electrode sealing parts, coils formed of high melting point metal and covering the electrodes at parts where the electrodes are sealed, and a shroud tube arranged on an outer circumference of the arc tube. The rare earth element halide is contained 40-95% based on a total amount of the halide as metal halide inside the arc tube. A distance L between an inner surface of the shroud tube and the arc tube satisfies 2
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