There are quite a few ways to get your temperature down. What size grow room do you have? If it is an actual room, look into getting an air conditioner for it. If it is a smaller space, buy a fan and air cool your light. Boyznus is right though, all this information is already here on the board by using the search button. It sometimes takes a little time to find your answer, but it is there. Also try this website for some good info:

http://www.drugs-forum.com/growfaq/G...c%20Topics.htm

If that doesn't have the answer to most of your questions, then start asking around. Good luck with your grow.