the 4x250s being better than a 1000w is a myth let me explane.
you want to use 2 hps and 2MH for a better mix of light. 2x250hps put out 50,000 lumans 2x250MH put out 38,000 lumans total of 89,000 lumans. 1x600w puts out more light than that 95,000! 1000 watts put out around 140,000 lumans and...