Wow! You just made me think of those blacklight posters from the early 70s.I had a Led Zeppelin poster with the exploding blimp...Sorry about the flashback.
I bought a "Purple Photon 3" keychain black light from www.photonlight.com for ~$10. It does cause corals to fluoresce when used at night. It is all that I need for my 75-gallon aquarium.
Since the wavelength is 370 nm (UV-A), a black light is not something that I would put in a fixture for regular use.
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