If you don't have CFLs then just let it be. Halogen and "regular" i.e incandescent bulbs get quite hot and are more trouble than they are worth. If you are in the store and you see some CFLs get 26W or higher, they shouldn't cost too much, and you can use a regular light socket with them. If you are interested in more detail on lighting, go to the General Marijuana Growing forum and read the sticky at the top about lighting. What I've written here is just a starting point for a dude on a budget who is starting out.