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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.
TV manufacturers say that most DLP rear-projection television lamps last between 1,000 and 2,000 hours. However, these burn-out times vary and can range quite a bit. Some lamps last only 500 hours, while others can last 8,000 hours or more. Much of a lampâs life span is based on its usage. On average, most lamps are replaced every one to two years. Lamp replacement costs vary widely and depend on the lamp and its manufacturer. A quick Internet search or phone call to the manufacturer can pinpoint how much a particular projection lamp costs.