how big is the closet?

4 x 3 x 7 ..

1000watt hps

with a squirrel exhaust fan on the door nob blowing air out of the closet (if you can, hook exhaust to the hps light fixtures.... this should bring plenty pof fresh air into the closet from the crack at the bottom of the door and blow all the hot air out the door knob)

Mylar the walls.

and get a small ocilating fan(will come in handy)....

Soil - 6 - 10 plants...

you'll be in bliss in NO time at all!!!

: )