6' x 6' Closet with plenty of Mylar. Soil (personal mix of peat moss, soft sand, perlite, vermiculite, sea bird and bat guano and heavy potting soil.
Veg with 400W MH and supplemental warm and cool blue Flouros.
Flower with 400W HPS.
I use organic fertilizers and nutrients, usually Earth Juice Bloom during flower and supplement with their foliar spray.
During Veg i use supplemental macro and micro nutrients in the form of crushed and dissolved natural minerals like Co, Cu, Fe and Mg. I also sparingly use Superthrive.