Hi Phallgirl, from "watt" I understand, the 24inch tubes really are not long enough to do much good. I don't know a lot about the T5, 8 or 12, and I don't know if I would trust homedepot enough to rely on them to know what the different Ts mean. (no offense to homedepot really). I know what you mean by being short of space though, do you grow near a window (hopefully a south facing0? You can also grow the lower light plants like the Phals. I am amazed at how much the information around the care of orchids has changed since I first became aware of orchids in the '80s.
mary
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