Grow Room Advice

hello i have a 2"x8"x7" room set up with two 400w mh hps co2 fed no need for intake then if im correct but what i was wondering with this set up what would be my max amount of plants figuring at least 2sqf for moving and fan and such any advice would be much obliged ive been waiting to start for so long just now have everything i need
 
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