I had great results using 1 400w hps in a 4' by 4' space Wasn't even a grow box just some 1x1's with some walmart emergency space blankets stapled to them http://www.futuregarden.com/lighting...ow_lights.html
DamianLucifer Reviewed by DamianLucifer on . 115 watts per square foot I plan on using around 115 - 120 watts per square foot during bloom in a room 4x4 or 4x6. Is this way overkill for very high quality mary jane? Rating: 5