ok so update yes i want 20 pounds NOT ozs the plants will flower under just the sunlight in April and May. The lights are to help them veg which is going to be around 7 weeks then 9 weeks to flower harvesting in the first or second week of may. They will be in 25 gallons of soil and should get pretty big. The coldest it gets here is low 30s high 20s F and then there is really good solar output even when it is cold. My thinking is even with not optimal sunlight there is still more lumens per sq ft then a
400-1000 watt light could put out.