VerticleGrowing Pictures and Questions

I'm preparing to do my first verticle grow (second grow in total). My plan is to hang two hang two 600s in a full circle in a fashion similar to the far right picture in the first image below whereby I would grow 8 tall plants (6') and attempt the uniformily train the vegitation to be appriximately 1' thick. My question is regarding the desired circumferance (or interior diamter). My thought was to have the interior diameter 3 to 4 feet, but the difference in circumferance is significant between a 3' and 4' (approximately 9' versus 12' feet). Obviuosly, I'd like to have as much grow volume as possible, but I don't know if a daimeter of 4' is too far from the light (the front of the vegitation would be 2', and the back of the vegitation would be 2.5'-3' away, depending on how "thick" the vegitation becomes (back wouldn't be getting much light anyways). Is 2' too far away? Again, I'd be hanging/stacking 2 600s on top of each other (separated by about 1') to cover about 5' in height of veg (similat to Heath Robinson's verticle tree grow, only I'm planning to do 8 plants instead of 2).
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Here are a couple pictures of my current Blue Dream (after 4 weeks of veg and 4 weeks of flowering) that I'm cloning for this purpose...I "think" the vigorous/stout plants will be ideally suited toward a tall verticle grow.



Thanks for the input! P.S., below is a picture I lifted from another verticle grow...I like the idea of using wire to train/guide the foilage, but for my grow I'd want to have more depth the the foilage to absorb light getting through the first "layer".

No replies. Let me simpligy my question - when using this growing method and 600 watt HPS lights, is 2' away from the plants about right?

with a 600watt hps?? if that's what you mean then that would more than likely burn the plants

2', not 2". That's feet. Certainly won't burn 'em...my only question is if that is too far away?

you can get much closer, if you want. just be warned that plants grow, lol... so what was the right height this am might be too close by this evening, and your shit gets burnt. i wouldnt go any closer than 8-12"