Stacked or staggered?
Its funny you mention that.. The friend I first setup with this minimal layout does exactly that. He sort of just dropped bulbs down into his canopy as his budget allowed. Right now he runs 4k dropped into circles as I am doing but also has a few 600w MH lamps that he drops down into the middle. He handwaters so his layout is a bit "stretched" out and at an angle to give him the ability to get in there so the 600w lamps are nice to fill the voids.
Its funny you mention that.. The friend I first setup with this minimal layout does exactly that. He sort of just dropped bulbs down into his canopy as his budget allowed. Right now he runs 4k dropped into circles as I am doing but also has a few 600w MH lamps that he drops down into the middle. He handwaters so his layout is a bit "stretched" out and at an angle to give him the ability to get in there so the 600w lamps are nice to fill the voids.