Hey bro what good is your fan gonna do on top of the lights????

Set a fan to blow right across the canopy of the plants between the lights. You can get the lights with in 1/2" with good breeze.

I like the arena setup you have created.

But you're really gonna need to blow the air both across the plant tops and out of the arena.

Nice work.

Your lights are fine for right now and should be fine for the next 3 or 4 weeks if you keep them really really close to the foilage, which you can with the fan.

I still prefer CFL over MH for veggin indoors but just get a 600W HPS for flower and you'll be fine.