indoor growing question

i have a 2 1/2 foot by 4 foot room with a 400watt hps/mh light mylar on all walls . how many plants can i grow in there . i am using 2 gallon pots and how close should they be to each other ? also is ultra peat a good soil to use ? thanks for your help i know i ask alot of question but i just want to make sure everything works out right and you guys are the experts at this .thanks again......

you can grow 50 small plants or 1 large plant, it is up to you. it just depends on how long you veg for. for your first go round you i would use any cheap soil until you get some experience and get things dialed in.

im growin 4 in a 2 1/2 foot by 2/12 foot check my journal out in my sig u will get 6 in there easyras

you can grow as many plants as 2 gallon pots you can fit into each room.

i wouldnt use just peat... if thats what it is... if it has perlite in it that would be good. otherwise you might have to get some to help with draining.