...in that it would be great for veg... but can you get those tubes in any colour temp, other than 4100k? I personally like 4100k for a veg colour, but if you wanna take the darlin's thru the whole show with those, you should be able to switch out the tube(s) for 2700k at flowering time.

I would suggest looking into using a schwack of 23-26w CFLs, if for the only reason(s) that they're easily available, easy to work with, and get closer to 70 lumens per watt, rather than the 50-something that the VHO T-12's git ya...

But look into what physical temperature they get their maximum efficiency at... Not sure about T12's, but T8's have one advantage over HO-T5's... they get max efficiency at 75f, which is the exact temp your garden should be at. T5's get max efficiency at either 85f or 90f, which is too hot for the plantlets, so if you're running them in/at the cooler temp, they might not be running at full efficiency.

Oooorrrr.... see if you can get the Sunblaster CFLs, which only use 26w, but put out 2400 lumens each, for a freaky efficiency of 94.4 lumens per watt (Metal Halide territory)! They're also available at both 6400k, and 2700k colour temperatures.

Hope this helps!