In another post, someone was asking about black lights.. Are they really emitting UV? Is it enough to be dangerous? In theory I mean. Obviously (scratch that, I mean: 'one would assume') they wouldn't market them if they were actually dangerous when used properly. My son lights his room with them. Is he exposing himself to an excess of UV? Also, do they put out more heat than normal bulbs? They seem to get very VERY hot. It occurs to me that using more than one in a fixture might be dangerous.