Stadium mast pole

High-mast lighting is a tall pole with lighting attached to the top pointing towards the ground, usually but not always used to Light a highway or recreational field. It is used at sites that require lighting over a large area.

 The pole that the lighting is mounted on is generally at least 12 m (43 ft) tall (under this height it is referred to as conventional lighting system),while the lighting consists of a luminaries ring surrounding the pole with

 one or several independent lighting fixtures mounted around it. Most units have four, six or eight lights in the ring, with three, five, ten, twelve and sixteen lights used in rarer instances. While most high-mast lights

 are High Pressure sodium other types such as Mercury Vapor , Metal halide  and LED , have also been used. Some units have the lighting surrounded by a circular shield to prevent or reduce light-Pollution or light trespass from affecting neighborhoods' adjacent to the highway. Maintenance of these systems are done by lowering the luminaries' ring from the mast head to the base using a winch and motor to the ground or at a height accessible by located in areas to allow for easier access without disrupting traffic.