oh im not too high of wattage. 1.6k isnt much, my buddy runs 10x 600watts.
But I decided to upgrade, got the 600 and a new hood, Sentinel CHHC-4 controller, Co2. 7x7 insulated room (6.5x4.5 drain table) can nicely and neatly pack 60 plants in 1 gal bags. 20 plant 3 week rotation SOG.
(the 600 and 1k are vented independently of the room, ducting just isn't hooked up in pictures., its CGE at the moment with a cabon scrubber to take care of humidity when need be) (only the 1k is running in the pics)
without the 600: