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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 standard deviation, along with a given average life, provides a way to estimate individual lamp failures. For example, consider two T8 fluorescent lamp models with an actual life of 24,000 hours and standard deviations (failure rates) similar to models 1 and 2 in Figure 8. For an office space with 100 lamps, the first lamp failures would be expected to occur before 17,300 hours for model 1 and 11,800 hours for model 2.