A tent?...inside a closet?...or just out in a room?
Tents are just as tricky to ventilate, as closets....but yes...the temps must be maintained and the ventilation, too. The main problem with tents...is the low heights. Once you hang the lights...there not enough room for the plants to grow up...unless you plan for it...way, way in advance. (SCROG) (LST)..etc.

hydro growing is even more tricky...than coco coir...IMO.

If it was me?....I'd buy a 250/400 watt...ballast, bulb and reflector package online or somewhere local....and do my first grow in soil. After you learn the basics of growing...then, you can go hogwild, later....:thumbsup:

Google: Grow Light Systems. (I like access discounts)