What is high mast lighting?
High mast is installed around urban interchange so that more light can be spread across a larger area. It is done to increase the visibility of the roadway. High mast lighting is referred to as when a pole with lights are attached to the top. It is used at places where lighting is required over large areas.
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 requiring lighting over a large area. The pole that the lighting is mounted on is generally at least 30 meters (100 feet) tall (under this height it is referred to as conventional lighting system), while the lighting consists of a luminaire 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 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 neighbourhoods adjacent to the highway.
Maintenance of these systems are done by lowering the luminaire ring from the mast head to the base using a winch and motor to the ground or at a height accessible by a cherry picker and located in areas to allow for easier access without disrupting traffic.
The importance of high mast light
The urban cloverleaves being the vital junction of the modern communication system, its lighting design plays an
essential part in traffic environmental lighting in night. Regarding from no matter what the visual and mental health of drivers, the functional lighting of urban cloverleaves are closely related to the urban traffic safety.
Improving the lighting environment of urban cloverleaves, and controlling effects of obtrusive light high-pole luminaries emit toward drivers, and effects of spill light emit toward the nearby residential area, that is a quite widely concerned topic by our country and the whole world about the urban construction.
According to the releavant clauses the recommended parameters theoretically provided in CIE technical report; to consult lighting quantity standards, the paper induces lighting quantity recommended limits applicable to our country urban cloverleaves. The innovation of the paper is to apply an important method firstly that using T1 parameter which CIE recommended value of T1 applicable to our country cloverleaves by measuring data, subjective evaluation, lighting simulation software.
The paper investigates the present situation of high mast lighting of our country urban cloverleaves in Tianjin and in Beijing. Then adopting lighting simulation software, the paper induces the problems of high-mast lighting of cloverleaves in our country cities. The paper puts forward some improving advice depending on several aspects.
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