Outdoor Multi-use Solar Perimeter Lighting by Unique Arts. You can use these solar string lights for driveways, patios, planting beds, fence accents. A total of 20 LEDs—spanning a length of 50'— blend flawlessly into landscape and provide warm, pleasant lighting around porches, along railings, or throughout tree branches, automatically turning on at dusk and off at dawn via an internal photo-cell sensor.