The best outdoor Christmas lights are usually the LED ones, as they are energy-efficient and durable, and come in a wide variety of colors and styles to fit any decor. The most popular types include icicle lights, net lights, and rope lights. You can also consider pathway lights or spotlights to illuminate specific areas of your yard, and light projectors for a fun, festive touch. Whatever you choose, be sure to check the light strings for any loose bulbs or exposed wiring before use.