There are both line voltage (120V) and low voltage (12V) systems. I recommend a combination of the two. Mount 120V fixtures on the house to create a brighter punch of light when homeowners want to enjoy their yard from within. Use a low voltage system to highlight plants, sculptures, water features and pathways when people are outside. There are low voltage starter sets that people can install themselves; they run about $150. These don’t last a long time, but they do offer instant gratification. I would recommend better-made fixtures installed by a licensed electrician. This costs more money, but the system will last longer.