I'll say a couple things before I say a couple things.
Too many people, myself included...get excellent results using fluorescent lighting. The more I read around different forums, the bad rap seems to come from folks that arent getting the most out of their fluorescent set up, or, prolly have something not all that practical till a plant has tons of veg growth for catching the ambient light of a fluorescent.
Thats why CFLs kick ass. The bulb's ambient light doesnt get too far away from the lamp, easier for the leaves to bask in...keep the lamp 3'' away from the tops...what stretching?
Stage growth is all about an abundance of the right part of the spectrum. Vegging under fluorescents with anything warmer than 6500k....well...I'll just say that the plants prefer, and more naturally make use of cooler colors for their vegitative stage.
Warmer colors and mass production havent met fluorescents yet. 2100K is the temp to go for for flowering.
Myself, I switch over to HPS for flowering. Which will eventually be supplimented with 2100K fluorescents.
Those 4 or more tube fluorescent fixtures...hmmm. More a commercial grower's choice is what they seem to me. Or the personal grower with a pretty large scale personal grow happening, the first time personal grower, who wont end up with a steady stream of females for a good while to come...those big ass fixtures put out a lot of light that younglings just dont have a chance to get a hold of...reflector or not.
And being as a person would want the best color light...those multi-lamp fixtures mean buying two more of each color they come with. Right about then they've crossed into 600watt HPS digital ballast territory.
Anyway, I'm not knocking the larger fixtures...just saying that they're better suited toward other uses that a small grower isnt likely to tap into.