All strains are different. Strains that are heavy producers can have more tops and smaller root zones and still produce large colas. Other strains that are light producers will have popcorn buds if they have too many tops and not large enough root zones. Strains such as blue dream, hash plant, green crack that produce more, you can place less of them underneath a light and have more tops so you will still be able to average about 1.75 pounds per 1000 watt light. With strains like Girl Scout, or OGK, or any other strains that produce less you can place more plants underneath the light and they will have less tops this way they still produce large colas and you can hit close to the golden 2 pounds per light. Generally with coco or soil you can 5 gallon pots for heavy producers and place 9 of them underneath a 1000 watt. With light producers you can use 3 gallon pots and place 12 to 16 of them underneath a 1000 watt. One benefit of using more plants is generally you have a shorter veg period and you can still produce large quantities....but then laws and regulations dictate everything.