This is my latest idea... -buy three 4.5 foot tall aluminum garbage cans, putting screened drain holes in the bottom and then puttting in 4 gallons of soil. -installing. 2 pvc passive intakes 3 inches above the soil line (painted black and made with 2 90 degree bends to stop light reflecting ) -installing air duct exhausts 1 inch below the point where the trash can lid rests when in place -light seal the lid with weather stripping -installing my cfl lights hanging from the inside of the trash can lid -installing small desk top, dollar store type fans to the inside of the cans for air circulation -running the exhaust ducts from all three to one airtight box containing my air filter and exhaust fan I am thinking this will provide an enclosed, reflective, environment contained in the planter itself. My drawbacks may be some plant mainenance, somewhat negated by some LST, but other than that I see no issues... Anyone ever seen or heard of this being done? I'd like some input prior to getting started on the project this weekend.