I use bullets on 3 trees and they work great. I have found that 3" spacing works just fine. It also requires less nodes, less power, less money, and is less bright. Even at 3" spacing when I have a lot of lights on it lights up the neighbors house and yard across the street very bright. 2" spacing will give more detail to graphics, but for most things 3" works great, especially if you have a tall tree, mine is two boscoyo strips tall. but my 8ft trees look fine as well.