New Grow Room 2.0 x 2.0 x 2.0 metre

Hi all. Just got a 2 x 2 metre tent not sure what to do here lol.
I have 2 x 600w hps already should I add another 2 x 600w lights or give them the cut and just run 2 x 1000 watt lights in this space?
Lights are not cool tubed will probably have heat issues which ever way I do it? I have 1x 150mm budget inline for intake and one of these http://sog.shopau.biz/catalog/product_info.php?products_id=1411 for the exhaust.. carbon filter is 150mm x 1080mm in size
I plan to veg and flower in the same room as I am limited on space now I only have a 3 metre by 3metre tool shed top work with lol

4 air cooled 600 watters is what i would do, 600's are more efficient and 4 of them will cover more area than 2 1k bulbs

ghb said:

4 air cooled 600 watters is what i would do, 600's are more efficient and 4 of them will cover more area than 2 1k bulbs

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I agree with this. Better distribution with 600s and better lumen/watt.

I 3rd that 600w vote !
They ARE the most efficient bulbs on our market, in terms of overall cost to operate and what you get out of it compared to 400w or 1K's.

by putting both fans as exhaust you will be better venting than if you had one intake and one exhaust

ya thats what i would do to 600 w is good hell ya

as zem said both fans as exhausts

also 4x 600w is the best option way better coverage and better lumen to watt ratio!