I just Finished making 2 UV lights using Simons s2 Host + and his 1A drivers these visible light filters and these emitters by led4power for work and have been having so much fun grossing out my family and friends with pets and carpets. I have made UV lights before and have had limited success in this regard even using more powerful emmiters but the visable light created always made it difficult to see the forensic stuff. With the visable light filter lens in place and a dark room EVERYTHING is visible with these lights. But watch out for ancillary costs my wife made me run out and get a wet carpet cleaner the next day which cost several times what the light did!
edit I should note that these emitters put out substantially more UV than anything else i have used with the exception of the LZ1 and even then the output is close enough considering the cost difference. Cures UV adhesive in seconds and turns my auto darkening glasses fully dark in seconds as well. I use them for finding the Tin side of glazing and to identify florescent tracer dyes at work.