I have a 2x4 ft tray under 1000. I have only been putting about 15 plants in that tray. Now the total span is supposed to cover 2 2x4 trays, however I am not producing that much, and I really do not feel the light distrubution would be sufficient. I think it would end up comming out as the same yield on one tray. Less light to go around, too many plants shadowing each other. I would only do a 2x4ft tray under 1000. And make sure you have panda screen all around, to reflect the light back onto the plants. You will have to have an ac to cool that 1000, or the temps will soar over 100. I also have a fan set-up into the light to suck out hot air that goes into my ceiling fan going outside.