Most street lights are either 240V or 480V single-phase, the higher voltage allows for smaller conductors over longer distances. Shorter, more decorative pole l

Most street lights are either 240V or 480V single-phase, the higher voltage allows for smaller conductors over longer distances. Shorter, more decorative pole lights (say in a CBD) might be 120V. Commercial pole lights can be 120V but are usually 208V (for 208V 3-phase services) or 277V (for 480V 3-phase services) in practice.