I've got 5 plants in there now. Have done everything from clones. I had one plant just start herming about 8 months ago.Ended up with one seed off of it and the seed is going gangbusters.
They seem to be doing quite well with the 16 bulbs. The buds are nice and firm and tight when harvested. I'll probably give 2 400w hps lamps a try in the near future just to see the difference.
I read an article a while back where you could just rewire the T5 bulbs themselves and overdrive them. Haven't tried it yet.