Well, I run 4x4 trays with a 1000w and I think it works out great. You don't want them right up against the wall, but I think by the done they probably hang over 6" around each side, giving a 5x5 implant. I generally have 15 plants in a tray. How tall are yours when you flower?
Mine is a drip system in a tray with square pots 10" high, and about 5"x5" at the top, filled with hydroton. I've gotten 2.5 oz of dry bud per plant (dry).
SpaceNeedle Reviewed by SpaceNeedle on . Why are Trays 4X4 not 5X4? Please Help This is frustrating the high hell outta me. The best I've ever done was my very first cycle when I put threw the plants on the ground and had no trays at all. I did about 17 plants per 1000 watt lamp, and now that I have all trays... I have a hard time wrapping my head around why the damn trays aren't 5X4 to begin with. The lamp can cover a 5X4 area. The guys at the shop tell me, "Well, the company that makes them assumes that your plants hang over and fill that area on the outside..." That Rating: 5