[HHGreenHand]

Very pretty, my friend. Great, healthy growth. +rep

And also, I believe someone earlier brought up the idea of reflectors and you had seen ones that dont fit.
Consider procuring some thin sheet metal, cutting with tin snips, and designing your own. You will get alot more of the CFL light directed downwards which will only benefit the plants. You seem like an intelligent guy so im sure you dont need instructions. The lumens rated on the package are given off in every direction. You'll increase the amount of lumens reaching your plants. Those CFLs stay somewhat cool. No venting will be nessescary.