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Once it cools, it should function properly again. A lava lamp may overheat in eight to 10 hours, depending upon the bulb and brand of lamp. Use the lamp for less than eight hours at a time for best results, allowing it to cool to room temperature before using it again.
How Long Does Your Projector Lamp Last? Please let me know how often you have changed lamps in your projectors!!! Well, I just changed the second lamp on my Optoma H78-DC3 after 630 hours and about 9 months (of course after the 6 month warranty). The first lamp was replaced after about 500 hours.