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Photo-period or auto-flower plants love their light. And as stated in the other thread that 200 watt cfl will grow plants. That 400 output comparison is to a incandescent bulb not an HID bulb. Please don't mistake the two when it comes to plants. They wont I promise.
So yes that light will do the job. But you will need ventilation either way. Plants must have fresh air.
Quote: So three of these small, cheap and environmentally-friendly CFL bulbs would have a combined output of 30,000 lumens. That easily rivals what an hps or metal halide can do.
Three of those would do 30000lums indeed no doubt at 600 wwatts used. One 400 HPS can do as much as 55000 lums depending on choice of bulb. In case you didn't catch that at 200 watt less one could have 25000 more lums. Not to mention two less bulbs.