You would get better coverage, and a lower light bill, with 2 X 400, but more lumens with a 1000. If it were me, I would run with the 2X400. But I am still relatively new to indoor growing, and there are much more knowledgeable people around here, who can better help you.
a single 1o00w bulb puts out a 3x3 main light footprint with the edges dropping off in par value pretty quick. You should do fine with that setup in that size tent
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