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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.
Although most lamps are rated for 1000 hours of life, we recommend changing them at between 600 and 700 hours to guarantee optimum tanning performance. For best results, always change all of the lamps at the same time. This will reduce the likelihood of some lamps being weaker than others are.