When I saw how cheap this drop in was, I decided to pick one up to mess around with. I think it's really neat, even if not all that useful. The blue light this thing puts out is really intense. It's sort of a deep blue. It look really cool (no pun intended). Everything the light touches becomes blue, though it seems to fluoresce bright orange objects. So that might be useful for something. I have it in a matching blue Solarforce L2p host. Lighthound's service was excellent when buying.