dude tbh, last round i used 3 gallon pots but i transplanted too late so they never utilized the 3 gallons, they stayed in a 4x4 rootball. i wouldnt use less then 3 gallon esp after seeing the yield on a 4x4 rootball. if you have 25 plants under the two lights ....in a 4x4 tent. you wil get a good yield. expect just over a pound IMO.