Experience with a dual air cool tube?

Curious to know how this product works over a 4x8 flower box? Seems to be a smart product.

http://www.hhydro.com/Dual-Air-Cool-Tube-60.html

I've used this product and liked it very much-----kinda a pain to slide the lights out to replace or clean the middle of the tube.

Wish there was an 8" version.

A~~