If he does a SOG he shouldn't have any lower bud sites. At least if he does it right anyways...

There are a lot of variables though. How many plants, how big of a space, Wattage of the HPS and of the T5 fixture, what kind of reflective material, etc...

In my opinion, I would at least try the T5s. But if you do, SOG would be your best bet when using fluorescents of any kind. And considering you will be using mylar you should be sure to make use of it best by making a smaller enclosure inside the closet. But again, there's another variable here, what are the dimensions of the closet? This will allow you to make that T5 pretty damned efficient. The key to using fluorescents effectivly is keeping the light as confined as possible. If you cannot do this I wouldn't try using the T5 for flowering.

On the other hand, if you're using your whole closet as the grow space you would probably be better of with the HPS. That is, of course, providing that the HPS produces at least double the lumens the T5 does. And like you said, you're worried about heat and that would be about the only concern you should have with the HPS really. If your HPS gives off more lumens then I would definatly attempt to accomodate for the HPS.

How many watts are the HPS and T5 Fixtures?
GRB.4.Life Reviewed by GRB.4.Life on . Who's working with T5s They keep calling me and I have seen other logs elsewhere where T5s are being used from seed to harvesting. Is there anyone here using them? What were your results? What were the positives, negatives? Thanks! Rating: 5