Okay, I know they'd fade faster over time, but I was wondering about putting Black Lights in my lava lamps. I have my 5 lamps going, and they were getting a bit warm, so I decided to turn the lights off for a few minutes. I realized that I like them much better with dimmer light for some reason. And I think blacklight would just look cool anyway :)
I'm actually going to try frosted bulbs as soon as possible for that reason, also. But was just curious of they sold lava lamp size blacklight bulbs.