I wanna UV LED light too...
Sorry if I'm horning in, but I want an LED UV flashlight too.
I can tell you what I would want it for: It would mostly fit into the "toy" category. I definitely do not have a "serious" professional use for it, like those who go Scorpion hunting, professional cleaner stain locating, retail counterfeit money detection, or bouncer/hand-stamp checker where I'd be using it 24/7.
I just want it for exploring, informal experimentation, looking for unexpected sources of fluorescence etc. Light duty pet-stain location, charging up glow-toys, showing the anti-counterfeit features of U.S. currency and credit cards as a conversation starter with my other geeky friends…
I know there's a difference between the shorter (stronger?) wavelength 370nm LED's and the more "purple" 400-something nm LED's which seem to be cheaper. Is it that important if it's just for goofing around? The only thing I do know is that I want something more powerful and brighter than the Photon-style coin cell size light. Something hand-held, about 2xAA, 3xAAA or 2x123 size is fine.
I see some reasonably inexpensive eBay listings for a 14 LED UV light that's only about $12 + $8 S&H. The seller has a good rating too.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=16037&item=5196359767&rd=1
Nor does the seller insult your intelligence by labeling it "RARE, ONE OF A KIND! LIKE CSI INVESTIGATOR!"
Few, if any of the online retailers, other than Xenopus, make any distinct note of the wavelength, and while his products, especially the nice
M@G adaptors look great, I think they're a bit out of my price range for a "toy". I guess I'd have to assume that unless it's mentioned they're all in the higher 400'ish nm category.