Check out this awesome potato bucket garden created by /u/macscots.
I use potatoes and other tubers to help recycle the dirt from my other grows, they seem to love the nitrogen depleted soil. Her bucket included the base shown (made from other bucket scraps), then a few spacers totaling about 1" in length at the end, and then the top with the LED, 2 PC fans were used for cooling. For the soil I used Fox Farms OF from other grows, with no added nutrients. As for the light configuration, I am using a 180w UFO LED light, which according to my measurements draws about 90 true watts. Thanks for looking!