you should shoot for atleast 50 watts per sq ft dont really consider it overkill until you get over 80 but even then it could still be of benefit if your suppling side lighting to large plants even a 1000 watts over 1 7 footer isnt going to have well developed lower buds the light just cant penetrate that far, so would consider over 80 overkill unless you are doing it for large plants or a verticle scrog or someway of growing that you are using alot of the height of the room as per efficiency a grow room utilizing smaller plants and more of them is going to be more efficient as you will use less wattage for both veg and flower and have more harvest per year.
bejay Reviewed by bejay 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