| 摘要 |
A high pressure arc discharge lamp apparatus comprises a lamp and operating means therefor, the lamp comprising an envelope containing a dose of mercury and a pair of electrodes with their tips ( 32, 34 ) spaced apart from one another to define an arc gap. At least one of the electrode tips is formed with a hollow ( 44, 46 ) in its surface ( 40, 42 ) facing the other electrode, and the operating means includes means for driving the lamp at an A.C. frequency of at least 200 Hz.
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