Well ive been thinking the same ideas, but heat is an issue with a 1000. I could proly run 3 600's in a giant tent and get better coverage(closer to the tops)and have less heat and use less power. But then again ive never actually grown with 1000's only 600's. So what if any is the difference in yields you receive from the 1000?
I've honestly never run tests to quantify it, so I couldn't answer that question regarding yield, other then saying "much more".
It's like asking "is there a yield difference between using a 250 and a 600?'
Well yeah, obviously there is.
And you really need to think about your growing footprint before you decide what lights work best for you - over a 4x8 table, 2 1Ks work great, but 3 600s would not adequately cover the perimeter.
On a 3x9 table, the 2 1Ks wouldn't get as good of coverage as the 3 600s in a row.
And it goes on and on..............figure out your footprint, then you can figure out the light(s) that make the most sense.