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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.
The same lamp, left on 24 hours a day, will last about 34,000 hours. While, a 48-inch fluorescent lamp will, on average, burn for 20,000 to 34,000 hours, the quality of light output gradually decreases over time. The economic life of a fluorescent lamp is only about 60 percent that of its actual burn time.