Get a small desktop fan at a local hardware store for 10 bucks. Have it blow over the plants eliminating heat, allows you to add more light if you are concerned about heat.
23 watts are good but a waste.. start getting 42 watts 45 watts or even a 36 watt cfl, they work really well, i used 4 cfls for one plant and my plant vegged beautiful.
I have 18 cfls over 7 foot high plants right now.. But if you do decide to buy a good amount of cfls just save the money and buy a 400 watt hps.. =]
I got my cfls for free so i didnt have to worry aboutt hat problem haha