doing a fluorescent tube grow myself at the moment. Today is the first day of flowering and these plants happy. Go with 2 or 3 T8 or T12 shoplights. 4 footers give off 2500-3200 lumens a piece and use either 32 or 40watts respectively. Really cheap, and stealthy, all you need is a fan and you've got a grow. I'll keep you posted on how well they work for flowering.