2 x 600w or 1 100w need advice

Right then have got 9 babies currently under 2 x 600w in a 1200 x 1200 x 2m tent temps are running fine at about 75f humidity bit low at 38% but trying to deal with that my question is would i be better wiyh 1 1000w or better sticking wiyh what i got thanx stuart.

if your asking if 1 1000W is more light than the 2 600W, then no its not.