Patent ID: 6814470
Filing Date: 2004-11-09
Classification: E01F,F21K,F21V,F21W,F21Y,G02B,Y10S

Abstract:
A highly efficient LED lamp comprising:at least one light emitting diode (LED) that emits light with a wide divergence; a transparent window to transmit light outside the lamp; and a non-imaging optical (NIO) element that collects light emitted by the LED with high efficiency, compresses the collected light and directs the compressed light through the transparent window with a different angular divergence in a horizontal plane and a vertical plane, and a precalculated intensity distribution across the divergent beam, wherein the NIO further includes, a refractive member located around a LED optical axis having a first end that collects light from the LED and a second end opposite the first end to transmit light; a total internal reflection member located around the refractive member, wherein the TIR member has a first end to collect light and a second end opposite the first end to transmit light, and a wall formed therebetween wherein an outside surface of the wall is curved to reflect light through the second end of the refractive member with a precalculated divergence that does not exceed a maximum angle; wherein the refractive member and the TIR member are integrated into a single transparent element having a mutual focal point, and wherein light is emitted with the precalculated angular divergence and intensity distribution across the divergent beam based on the curved outside surface wall of the TIR member and a curved surface of the refractive member, wherein the curved surfaces provide different angular divergence in orthogonal axes perpendicular to the LED optical axis and the curvature of the curved surfaces is a function of an incident angle, an intensity of the light source at the incident angle, a reflected angle, and a required intensity of reflected light at the reflected angle; and a housing connected to the LED through an electrical connector providing power to the LED.