Patent ID: 8733981

Claim:
A lens comprising: (a) a light-exiting surface provided on a top side of the lens; (b) a central light-refracting and collimating portion comprising a convex aspheric surface formed on a bottom side of the lens at a centre thereof for refracting and collimating a first portion of light emitting from an LED (light emitting diode) towards the light-exiting surface; (c) a first annular prism portion formed around the central light-refracting and collimating portion, and having a first refractive surface and a first total reflective surface, whereby a second portion of the light emitting from the LED is refracted by the first refractive surface and then reflected by the first total reflective surface into parallel beams towards the light-emitting surface; and (d) a second annular prism portion formed around the first annular prism portion, and having a second refractive surface and a second total reflective surface, whereby a third portion of the light emitting from the LED is refracted by the second refractive surface and then reflected by the second total reflective surface into parallel beams towards the light-emitting surface, wherein at least one of the first and second total reflective surfaces is in the form of a scale-like polyhedron.