An apparatus for use in a street light installation

摘要

An apparatus is adapted for use in a street light installation for illuminating a surface with an illumination pattern. The apparatus comprises:an LED light source; and a lens having a first surface that blends via a contour into a second surface which smoothly transitions into a third surface, which second surface and third surface are utilized to direct the energy from the peripheral beam of the LED light source, which third surface is divided into two subsurfaces by an intersection, which subsurfaces spread the light outward from the intersection in larger angles, so that when the intersection is perpendicularly oriented to the curb in a street light installation, the subsurfaces spread the beam through the third surface in directions away fro the intersection, wherein the lens is shaped to reflect light emitted by the LED light source from a curb side of the lens to a street side of the lens using a prismatic element defined as part of the lens surface, wherein the prismatic element comprises a total internal reflection surface arranged to reflect beam energy from the LED light source from the curb side to the street side such that more light is directed to the street side than to the curb side to render the illumination asymmetric with respect to the side and street side.