A friend of mine picked one of those up. It appears to run direct drive off one of those 3xAAA battery carriers. I didn't see any circuitry inside that would suggest it is regulated, or that it has any kind of voltage step-up.
Hey! I think this is the same light, for about a quarter of the price:
http://www.goldengadgets.com/product_info.php?pName=ultra-violet-14-uv-led-blacklight-uv1403
I have one of the 8 LED lights from Dae's shop as seen here. I think this is probably the same as the one on the Lighthound page.
http://www.qualitychinagoods.com/ultra-violet-flashlight-p-343.html
It is not as bright as my friends, but then again it doesn't have as many LEDs in it, and it cost me a whole heck of a lot less. It works well enough for what I want, though. It finds the cat pee in the carpet, and makes the security stripe in most bills fluoresce. If I wanted a brighter one, I think I'd buy one of the cheapies like the one suggested above.
Here's another option. Get a 3 cell Mag, and drop in one of these:
http://www.goldengadgets.com/product_info.php?pName=32-uv-led-retrofit-bulb-for-your-maglite
If money were no object, I'd consider one of the Aleph19 with the Cree. They're expensive, though...