Patent ID: 9739446
Date: 2017-08-22
CPC Classifications: F21K,F21S,F21V,F21Y,G02B

Claim:
1. An optical lens for an LED integrated light source including an LED light engine, said lens comprising:— (i) a lens body having a base where light from the LED light engine can enter the lens, and a light emitting front face, the lens body having a substantially frusto-conical shape having a central vertical axis extending from the base through the light emitting front face, said lens body having a height H between a bottom plane of the base and a front of the light emitting front face, and a cross-sectional dimension D (ii) a light entering section recessed in the base of the lens body adapted to accommodate an LED light engine, the light entering section having a cross-sectional dimension D (iii) the outer surface of the frusto-conical lens body between the base and the light emitting front face incorporating a plurality of densely distributed convex facets; wherein light from the LED light engine is focussed into a light beam between 15 degrees and 60 degrees about the central vertical axis, and wherein the ratio of D