I would do 3-4 with mylar lining box........<-----<<<is what im doing except I have a 400 w in a 3x3.5 closet with 6 plants and mylar...WooooHoooo and its going good ....
BlueDragonSmoke Reviewed by BlueDragonSmoke on . 250W HPS Is a single 250watt HPS light enough to grow and flower a single plant? Rating: 5