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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.
Philips and Osram are two of the most dependable brands, and you don't want to buy a remanufactured lamp. While the older DLP lamps last between 1,000 and 2,000 hours, the newer ones can give you 6,000 to 7,000 hours worth of TV viewing.