Ok, about the room, it's 4' x 4' x 5' high. All Tuff R(Celotex(sp) except the floor. two three inch vents at the bottom, one on each side. Exhaust is a small squirel cage from a house furnace with a two inch vent. Heater is a small camping unit, I never let it get below 75 degrees and usually keep it at 85 degrees, I have a therostat inside and out. The room is inside my polebarn that is heated year around and it is well insulated and completly enclosed(no light in or out). I am not savy enough to produce pictures but maybe one of the kids can, I will try. A word on medium, I use a mix of sterile potting soil(vermeculite(sp) pearlite(sp) and maybe peat? It's sold at a large nursery here) mixed about 50/50 with my compost(I have a large compost pile that I use on my veggie and flower garden) in 5 gal buckets, so far I've never gotten root bound, there's plenty of room left when they are done growing, I'm actually surprised at how small a root ball they make for the size of the plant, but I digress. Nutes are Miracle grow and or compost tea(from my pile of course) mixed in rain water(I will admit to using horse apples now and again just for the fun of it, lay them on top of the soil and allow the water to flow through, back in the day(yes, I am old) "they" use to say that was how you made "Acapulco Gold"(sp) but again I digress(must be the bud). The light is a 400w HPS from Michigan state university green house made by Sun Systems. The most I have ever grown at one time in this room is two plants but this time I'm going to try four. What do you think.