An LED roadway light is a highway lighting system designed for use on freeways, expressways, limited access roadways, and roads where pedestrians, cyclists and parked vehicles are generally not present. This category of products is so named for the purpose of differentiation with street lights which are used to illuminate roads with presence of both vehicular and pedestrian traffic. In the lighting industry, highway lighting and street lighting are two different types of roadway lighting applications. Highway lighting is intended to aid navigation and orientation of the vehicle driver on the road and help with the detection of obstacles within and beyond the vehicle’s headlights. The purpose of street lighting is to produce quick, accurate and comfortable visibility that may safeguard, facilitate, and encourage vehicular and pedestrian traffic, both on and adjacent to the street. In a nutshell, highway lighting serves the vehicular traffic whereas street lighting must ensure sufficient visual conditions for all road users which include motorists, pedestrians, and cyclists.
Roadway luminaires are mounted on heights of 9 m to 15 m. 9 m to 10 m mounting heights are usually accommodated by luminaires with system outputs of 15,000-20,000 lumens. 11 m to 12 m mounting heights will need a luminaire output of 20,000-30,000 lumens. A luminaire mounted at a height of 13 m or above is usually required to produce a minimum output of 40,000 lumens. Taller poles assist in achieving uniformity requirements and maximum spacing but may have complications of obtrusive high angle light and reduced levels of vertical illumination. Davit-style, truss-style and mast-arm lighting typically arranges the optical system of the luminaire perpendicular to nadir (parallel to the roadway. Spigots (head joints) with tilt adjustments may be provided for optimal orientation and aiming of the luminaire.
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