I wish I knew more about lava lamps when I bought them. These bulbs are designed for a specific type of bulb with a smaller base (about the size of the large Christmas tree strings. They don't match the ones I have. Mine actually use standard base 40 watt bulbs. These are good bulbs and they look like they would work fine if I had the right bulbs, the overall picture on the Revain website doesn't make this obvious, although the comparison photos of these and other bulbs make it clearer.
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