| 摘要 |
Methods and apparatus are provided for operating very high pressure short arc mercury discharge lamps primarily used for projection applications. The method includes controlling an alternating lamp current supplied to the lamp at a constant RMS value. In some embodiments, the lamp current is adjusted to a new constant RMS value to maintain lamp power between an upper power limit and a lower power limit. In other embodiments, lamp cooling is adjusted to maintain a wall temperature of the arc tube below a softening temperature.
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