Most people run the veg stage with lights that are not needed yet.
If somenone wouldn't mind telling me how to post picture's I'd be able to give you an idea of what 2 23w cfl's will do for veg.
the bloom stage however is a diffrent story. I to have a handbuilt peice of furniture that is 2x2x6, that uses a 250w hps. With an inline fan running now and then..(on a timer), my temps are never above 6f of ambient temp. I'm usually around 75-78f. My home is settled at 69 most of the time.
FYI.....your lights don't need to be hanging like that at this point of growing.
To be honest, blunt, and/or clear....your most likly not going to need to hang your lights like that at all with the amount of room you've given to your garden.
You have more surface area on the side of the bulb then at the tips. Understand?
2x2 is not enough space to make you want to waste the energy of the lights like that.
Good luck