Hey realistically in a 25sqft grow space...how is a 1lb or more not achiveable under two 600watt HID's? I didn't specify 8 week grows or training methods or anything...but with 25sqft of space you can pull that kind of weight given the right conditions, co2 injection, and good soil
You can easily pull 2lbs from 2 x 600s, you just need to do everything right. However, a 4x4 or a 5x5 space sucks for 2x600s. You need a 3x6 to a 4x8 space at least. In a 4x4 tent I usually just run 1 1000 watt light and pull 24-28 zips between 4 plants(coco coir in 25gal smart pots).
You can pull 14g per plant or 16oz per plant, it's all in the veg. I scrog mine for 3 months before they hit flower and the wait is totally worth it.
Ive seen 14oz pulled off a 400w, a 3 plant scrog.
2x600W would definitely pull over a pound if you knew what you were doing.
could try a 4 plant scrog or a perpetual SOG harvest.
Thanks for the input everyone. I've just popped my seeds 1 Superbud fem, 1 Moby Dick fem, 1 Bubba kush 33 fem. Plus I've got 2 seeds that are probably hermie(had a burmese kush that turned dudeish on me) and 6 that I"m almost positive are White Widow(male)xIce.