[fishytime]

Originally Posted by imisky

I got the acrylic tubes at industrial platics and paint, but you should be able to find it at any plastic store. As for heat issues I don't feel any, I've taken the t5 ballasts out many times and the ballast itself feels warm to the touch and does not melt the acrylic. I'm current testing out to see the effect of active cooling on the t5s and so far I don't see anymore light increase but I don't have a par meter to check with.

Im not positive but, I dont think "actively" cooling the bulbs increases the par....I think it decreases the drop in par from the bulbs running too hot, extending the bulb life....Ive said it before and I'll say it again.....mad DIY skills you got there man.....right up there with superfudge.....