new light

ok so im going to get a 400w mh/hps switchable light for my 4x1.5x5ft closet. whats the best way to ventilate this room and how many plants could i have at a time?

i to am building a setup with same deminsions. I was going to build a growbox but said screw it, lets go big. Experienced grower that I know said i could get 6-10 plants hydroponicly.

im growing in soil with flora series nutrients

Put an exhaust fan at the top suckin gthe hot air out from the light and put an open vent in the bottom to allow cool air to flow from the floor up past the light and out the fan.

Dont forget to use a fan to circulate the air in you grow box.

i dont have a box tho im using my closet. how can i get ventilation without cutting holes?

Without cutting holes ? You could get a cheap piece of thin plywood and make a door in the center and cut you ventilation holes in top and bottom.

You'll need to figure a way to seal up the closet and make ventilation and an access door for it.