I have a Digital Greenhouse 600w ballast and I can't find operating specs for it. I would like to mount it in my attic, but I live in a warm, humid climate and was worried that I would damage it/start a fire/reduce its life. I would imagine that it would be designed to use in high humidity, high heat places but I don't know. I asked the guy at the local hydro shop and he said it would be fine but I'd like other opinions. Also, how is the reliability? Has anyone had good luck with them?