which is better

either 2 1000w HPS or 3 600w HPS. I read somewhere that the 3 600w put out more lumen cause you can put the lights closer. could someone please clarify this to me.

you would probably be very effective with either.. as long as your grow skills match the lights. the 600's with digital ballasts would be more efficient, as far as your light output to power cost ratio.

what are the dimensions of your room?