I was going through some boxes the other day and found 3 of these that I had picked up last year at an auction, at the time I was thinking tortoises not guns, well anyway I set one up in a small enclosure with a top and very moist substrate,It is very warm and humid inside the enclosure without using any other heat source, the surface of the substrate is 83 degrees. I hung it out of reach of the tortoise using suction cups.It's 15 watts and 12 inches long and the max temp is 150 degrees.The top is not sealed tight to allow for air exchange so moisture is getting out but slowly. I think it's going to work. Time will tell.