We've been getting a large number of calls with customers who are having a hard time with finding a bulb that will make their lava lamp perform properly. It use to be that many of the Lava Lamps called for 75 watt or even 100 watt R20 flood lights.
As part of a governmental regulation, these bulbs have been discontinued. Now, lava lamp lovers are in a bind. There really is not a perfect replacement for the 100 watt R20 flood light. So, our recommendation is to contact the manufacturer of the lava lamp that you own. They know that the problem exists and will be able to tell you what bulbs you need to use now to activate your lava lamp!
Can't find the manufacturer? Go to the retailer where you bought the lava lamp and ask them about the bulbs or even for the manufacturer's information and let them know why. Retailers may not be readily happy to give out their factory's information.