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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 consumer watchdog and European partners tested five samples of 46 types of bulb. New EU regulations say that from March 1, 90 per cent of any batch of LED (light emitting diode) bulbs should last at least 6,000 hours. The bulbs were switched on for 165 minutes, then switched off for 15 minutes, in a continuous cycle until they failed. Five types of bulb, some costing more than Â£10, stopped working before 6,000 hours in the majority of samples tested.