An apparatus adapted for use in a street light installation for illuminating a surface with an illumination pattern, the apparatus comprising: an LED light source ; and a lens having a first surface that extends through an azimuthal angle of about 185 degrees and that blends via a contour into a second surface having a basal portion with an undercut that smoothly transitions into a third surface , which second surface and third surface are utilized to direct the energy from a 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 the subsurfaces spread the beam through the third surface in directions away from 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 pattern asymmetric with respect to the curb side and street side, wherein the lens surfaces are arranged to transition from the bottom of the lens, close to the LED light source , toward the top of the lens, starting from the second surface , via the contour , and then to the first surface on the street side, and wherein the lens surfaces are arranged to transition from the bottom of the lens, close to the LED light source , toward the top of the lens, starting from the third surface and then to the prismatic element on the curb side. an LED light source ; and a lens having a first surface that extends through an azimuthal angle of about 185 degrees and that blends via a contour into a second surface having a basal portion with an undercut that smoothly transitions into a third surface , which second surface and third surface are utilized to direct the energy from a 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 the subsurfaces spread the beam through the third surface in directions away from 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 pattern asymmetric with respect to the curb side and street side, wherein the lens surfaces are arranged to transition from the bottom of the lens, close to the LED light source , toward the top of the lens, starting from the second surface , via the contour , and then to the first surface on the street side, and wherein the lens surfaces are arranged to transition from the bottom of the lens, close to the LED light source , toward the top of the lens, starting from the third surface and then to the prismatic element on the curb side. <EOS>