I'm doing a grow in my closet in a space about 4x4x8 and 2 gal pots i wanna put a couple of plants in that area. i have two flourex floods pushin about 18000 lumens and i might get a 70w hps to work with the flourex in the flowering stage and i have two questions will that 70 hps influence the yeild at all and two how tall should i grow it