The same reason why iam not growing in an ebb and flow table or a Aero-NFT setup.
Height restrictions in my grow space.
I do not have the room to grow larger plants. I only have room to do a SOG
And hempys allow me to grow with a very low profile.
My large plants are done outside.
If I wanted to grow bigger plants inside and get the same yield as my SOG in the same amount of time. I would need to have double the height in my flower chamber and a veg room that is double the height and size that it is now with twice the amount of veg lighting.
lol ive been playing around with my numbers as well. i think the key is actually lighting.(surprise surprise) less plants = more penetration, better popcorn, at least so far. ive got a group of 8 and a group of 12 going atm.
its hard to say how it will turn out without knowing how dense it is but it looks pretty nuggety so im going to go with somewhere between 12-13 oz. very good run either way and i would be extremely proud to get a grow like this under my belt.