Solar-powered garden lights are an easy and ecological way to add illumination to your yard, porch or sidewalk without using any electrical wiring. Since they are powered by an integrated solar panel that charges during the day and turns on when it becomes dark outside, make sure you place them in strategic spots for maximum efficiency. Be sure to place them away from competing nighttime light sources like porch and streetlights. When other light sources turn on, the solar light sensors will react to it and either decrease the light output or not turn at all. Also, be sure to wipe down the sensors from time to time. Pollen and dust can prevent the lights from recharging during the day.