my growroom is exactly what ur using 8ft tall 4 ft wide...depth around 3ft.....make sure u have some side lighting one each side and use around 5 cfls above the plants....thats all ull need but make sure ur temprature hits around 75farenhiet and stays there throughout ur grow in dark and light times.<showing my growroom set up could cost me a great mistake being as this is a open website>