1000w or 600w

I have a 3.75m x 5.75m room and I am trying to work out what grow lights I should go with? I can’t decide 600w or 1000w and if it should be 3 600w x 5 600w or 2 1000w(maybe 3 1000w) x 4 1000w? Please let me know maybe there are other options?

one 600 hps can be stretch to cover 1.2x1.2m but better for 1mx1m
one 1000w HPS can be stretched to cover 1.5x1.5 in multi light room, better over around 1.35x1.35

So depends how much of your room you want to light, don't forget you need walkways and make sure whatever you do go for can be controlled as far as heat removal and ventilation.