Quote Originally Posted by Mr. Clandestine
If you had to choose between an independent CFL over each plant, or a 2-tube 4' T-5 fixture, which do you think you'd choose to produce the amount of foliage that I'm shooting for?
More is usually better as long as you can vent the heat.
Shoot for more than 70 watts per square foot of canopy with cfl's.
You can get away with >50W/Sq' if you use T-5's.