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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.
Compared to incandescent bulbs, fluorescent lamps are long-lived. Many are rated at 20,000 or even 30,000 hours of life (which is about 3Â½ years). Manufacturer's ratings of fluorescent lamp life are based on operating groups of lamps in a cycle of 3 hours on and 20 minutes off until all the lamps fail. The rated life is the time by which half the bulbs have failed.