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You can definitely use CFLs but the problem is light penetration as the light isn't intense enough to reach the lower part of a tall plant. So you can look into lollipopping which strips the lower branches off so the plant can concentrate its energy into the top portion that receives good light. You can also use LST method which trains the plant like a bonsai tree so that the plants get the most from the light you have. The other idea is to just get more CFLs.
However, I do agree with Spanky. Go for the HPS. I think you're better off. The light spectrum of an HPS is heavy into the orange-red zone.
As far as wattage use, you answered your own question. A 4xx watt CFL fixture uses 4xx watts. If you don't have a problem with 400+ watts, go for 400W hps.
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