On a 2 foot mini tree, I would say that should do just fine. As for the mega-tree, I think that you are way too thin. It would look ok with all of the lights lit but would look sparce if you only light one color. I was going to make a mega tree using 16 mega-strings made from Red, Green, Blue, and White light strings and controlled by an SSR4. This would require 64 channels plus 4 for the tree topper and they would be controlled with by a Freestyle. I have put that on hold since I intend to use smart strings when I do build one a year or two from now.