Incandescent isn't truely blacklight.
Blacklight is a certain spectrum of UV only attainable through a rarefied tube...(fluorescent)
The incandescent versions are a cheap knockoff that you won't be happy with.
fluorescent for sure
So. I am going to Spencer's this weekend and I want a black light because my dad made me jealous that he has one. So am I better off with a fluorescent or an incandescent light.