400 or 600 for my tent?

intensive said:

ive had big yields with 400 watts in the past, but it might have been the b52 superskunk strain from nirvana that helped.

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From what I have read on the forums, you yields will be even bigger with 600W, but like I said, its personal preference, temp is easier to maintain with 400W and harder with 600W, would you prefer bigger yields with slightly more stress or smaller yields with less stress, you will probably have to flip a coin for this. Lol. Good luck anyway!!

400 shouldn't raise ur bill too much. Run ur lights at night, that's off peak hours 9pm-7am u pay like 20% of wat ur charged on peak.

I was runnin 1800 watts and my bill went up 50 bucks more than usual.

In a 2x4 tent I think the issue is coverage. A 400W or 600W will provide the watts per square foot, but 2x400W would cover the space better. Even 2x250W would cover better than 1 light. Particularly well with your SOG style.
Sure, a 400W will cover 4x4, but I think you'll find the outer foot or so will suffer.
Good thing you bought the 400W. When funds allow, another 400W can be added.
Of course, you'll need some serious fan action too. With a properly sealed fan circuit drawing about 700CFM, cooling shouldn't be too hard. Add another small fan with a scrubber and you can grow some killer in there.
Fred