Thinking of upgrading my lighting..some?

I currently use 2 x 400W HPS for flower.

I've brought 3 plants to full term with the 400's with ok yeilds given the genetics. I was wondering if I should go to 2 x 600's or 1 x 1000.

My grow room is a dark room that is 4'11"x2'8"x6'7. I use a 449cfm fan to cool both air cooled reflectors and is exhausted through an odor sok into the main room. If I go to dual 600's or 1 x 1000 will the heat be too much for the grow area?

Will I get more light per square foot throughout the grow area with dual 600's or single 1000?

Thanks
 
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