Just a minor update guys. I've been experimenting with Cool Tubes and this is basically what I've come up with. I have two different products:
The Virtual Sun VSCR6000 and the iPower 6 inch cool tube (shown here). The VSCR's are quite a bit taller (not shown here).
I've settled on roughly the same POD design from before but just adding one more row for a total of 4 rows. I plan to use (2) of the VSCR's with 1000W HPS bulbs but if and when I encounter a strain that grows too far inward, then I am prepared to replace the tubes with the (3) iPower tubes using 600W HPS bulbs.
The basic idea here is that the carbon filter will serve as a foundation/base for the tubes to sit in. They will still need to be hung but more for stability and to prevent tipping. There will be a fan off somewhere connected to the top tube via flex duct sucking air. So the other purpose of the carbon filter is that clean air will be coming thru the tubes...hopefully will reduce the cleaning frequency.