The best Christmas tree lights are smart string lights, since you can control them with an app, smart switches, or even motion sensors. Because Festavia string lights also offer a gradient of color, they're the perfect decorative lighting accent for your Christmas trees. Start from the base of the tree and wrap the string lights around to the top. If you have a particularly large tree, you may want to use two string lights intertwined with each other to make sure they are evenly spread.