While the primer on the island support was drying, I worked on getting the LED fixtures laid out and secured into the drywall panels on the ceiling. The docs said to use a 5-3/4 inch hole, but that seemed too big to me. I opted for a 5-1/4 hole, which, coincidently, is the diameter of a Lipton iced tea mix lid. That made for a nice, snug fit so that's what I'm going with.