The answer to 'how to maintain landscape lighting' is to regularly inspect, clean, and repair your outdoor lighting system. This includes checking for any loose connections, replacing burnt-out bulbs, and ensuring all fixtures are securely mounted and free of debris. It's also important to keep the lenses and light covers clean to maximize light output.
Depending on the type of lighting you have, you may need to adjust the aim or angle of the fixtures periodically to ensure they are properly illuminating the desired areas. Additionally, you should trim any vegetation that may be obstructing the light and consider upgrading to energy-efficient LED bulbs when needed.