That's a nice set-up for $40. But for less money you can buy a bulb that fits in a conventional light socket and delivers more light in the same range; plus you can use it in any room in your house rather than squirrel your plants and their lights off in isolation!
Ott-Lite 17 Watt Plant Bulb
If instead you want to use 2' or 4' fluorescents in a greenhouse, this manufacturer also makes those. I paid $6 each for the 2' size last week in one of Fernie's favorite big box stores.