I'm a bit of a ghetto tinkerer. I saw some UV LEDS on Ebay and I thought I'd buy some to see if it's applicable for alt processes. http://www.ebay.com/itm/10x-1W-Ultra-Violet-UV-Purple-High-Power-LED-400-405nm-/110737016202 After receiving them a month ago, I was able to play a bit on my work bench. So far, it seems to work with cyanotypes. Here are some pictures. http://www.flickr.com/photos/mainecoonmaniac/sets/72157641172069904/ I got the heat sink from a scrap pile from work and borrowed a power supply. Optimal voltage is about 3.5v and draws .78 amps. My plan is to mount 10 on them on an aluminum heat sink that is 10x12 inches.