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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.
For older model projector (prior to year 2000), most projector lamps last approximately one thousand hours. Today's newer multimedia projectors feature projector lamps that will last for two thousand hours or more. A few multimedia projectors will produce up to four thousand hours of use, and a handful will boast an astonishing six thousand hours of projector lamp use.