Vertitube and Cool Tube users HELP

I am setting up a vertical garden and am trying to decide between using (2) 48" dual cool tubes vs. a single 92" 4 section vertitube Octagon Hydroponics' Vertitube Lighting System | Humboldt Wholesale.

Maybe its just me but with the vertitube I am concerned that the sections are very close together. Even considering they are 600 watt bulbs.

The dual cool tubes at 48 inches with two of them I would have much more glass to get better coverage on the plants and could space them a little further apart.

Anyone using either care to comment? Thanks

i use a vertitube, it holds "3" 1000 watters, i use 2 6" vertex fans, one in and one out, i can easily touch the glass, no heat. work frickin great.