Apollo13 said:

Personally I'd go 400 watt hps or maybe 600. But it's not just lights u need. When u go HID lighting, it is hot. So ducts and fans are needed. I assume CFL u choose for cheapest and easiest for you. It's far from what ur plants want. I know they live. But if u ever get a hps, u will see a huge difference in growth.

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Apollo13 said:

I have run 100 watts per square foot with outside like growth. Cooling is the issue. If the back of ur hand is hot under lights, it's too close, so height is the issue with HID too. I use a laser temperature gun on ebay for $10 to monitor leaf temp. Plus they are super handy and helpful.

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