Any suggestions for a good UV/black light?

Some of you may recall that I want a glow-in-the-dark bathroom. I’ve decided that the paint is far too expensive to use on walls, but I figured, hey, these are white walls. Stick a blacklight in there and it’s nearly the same thing.
I have heard good and bad things about screw-in black lights, that some of them are legit while others are simply purple. I’m also game for any kind of freestanding black light, if there is such an animal. Might even be preferable, so I can move it around.

Something that won’t give me sunburns would be especially good, though it would settle any vitamin D issues.