I don't think I'll use that other hood again since only one light works... Even with a single 20watt bulb, not all the plants would receive the same lighting because one side is dark and one is light, lol.
I'm not 100% sure actually. One of those things I've never bothered to look much into. It's just higher strength than regular flourescent. T-5 was supposed to be the best of the best strength wise but people are saying T-8 outdoes it now.
and thats as far as my research went lol
As long as I know it'll work for my tank that's fine by me!
Like I said, i have 15 watts over a 26 gallon and both plants and algea grow like weeds, so yours will be more than enough.