40B here as well! Going to do T5HO for now, but LED possibly in the future!
40Bs are the best!!
I don't know. I definitely recommend going the LED way.
It's going to be a lot cheaper
This whole build is equivalent to 3 t5HO bulbs, it's only costing me about $164
Considering a 36" tek light cost $256.99 not including bulbs i'm saving a ton of money!!
LED is the way to go!
even if you want super high light you can get 12 XMLs instead of 10 and it'll only be about $220, way cheaper than a tek and a bunch brighter!