I planned to go with a shadewell, my setup is quite complex, but i seem to get it down just about right. i pull fresh air from outside with a carbon filter, then comes into my room at the bottom, then another 8" fan, exits the entire room out the other 6" hole that i dug out. a sample of my two rooms that i rigged.
If you wanna go real low with the lights then i'd go with the tubes. but keep in mind that tubes block out some of the lights, due to the glass.
So where exactly is your exhaust going ? Your blowing the hot air into another room? Or outside