Your garden will have the bulbs orientated with the sockets towards the ceiling/floor once the bulbs are properly stacked around taller plants, right?
Come again?
My plan is to use that cooltube (which I just found a deal on and bought), on top of the fan, with no other tubing. I'm actually going to elevate the plants on a platform to get more control over the height of the cooltube, if that makes sense.