Grow tents have the advantage of being ready to use with premade with exhaust vents, reflective material & light hanging bars. Controlling environmental conditions is easier. BUT you can’t customize the way you can with a room with height or number of plants, etc. Canopy is the area of your grow room housing the plants. To calculate, divide area of the room/tent by the number of ft. you allocate to each plant (2-4 sq. feet is standard).
AREA OF ROOM OR TENT ÷ SQ. FEET PER PLANT= CANOPY