Granted Patent B2

US 12,571,517 · App. 19/025,795 · Granted Mar 10, 2026

Inventors: Fangxu Dong (Austin, TX); Horace C. Ho (Austin, TX); David J. Knapp (Austin, TX)

Assignee: Lutron Technology Company LLC

F21V5/007F21K9/233F21V5/004F21V23/0457H05B45/22H05B45/46F21Y2105/10F21Y2113/13

Abstract

Claims (23)

1 . A light-emitting diode (LED) lamp, comprising:

a parabolic reflector having a plurality of lunes that extend from an entrance having a first diameter an exit having a second diameter greater than the first diameter;

an exit lens having the second diameter disposed transversely across the exit of the parabolic reflector;

wherein the exit lens includes:

a first plurality of lenslets disposed on a first surface of the lens internal to the parabolic reflector; and

a second plurality of lenslets disposed on a second surface of the lens, the second surface of the exit lens disposed transversely across a thickness of the exit lens from the first surface of the exit lens;

wherein the first plurality of lenslets includes a lesser number of lenslets than the second plurality of lenslets; and

a plurality of LED strings arranged to form an LED array on a substrate, the substrate disposed at a focal point of the parabolic reflector.

2 . The LED lamp of claim 1 wherein each of the lenslets included in the first plurality of lenslets is configured with an identical aperture shape.

3 . The LED lamp of claim 2 wherein each of the lenslets included in the second plurality of lenslets is configured with an identical aperture shape.

4 . The LED lamp of claim 3 wherein a center of each of the lenslets included in the second plurality of lenslets disposed on the second surface of the exit lens is aligned with a center of a respective lenslet included in the first plurality of lenslets.

5 . The LED lamp of claim 4 , wherein the identical aperture shape of first plurality of lenslets and identical aperture shape of the second plurality of lenslets is a polygon having N sides, wherein Nis an even number greater than or equal to 4.

6 . The LED lamp of claim 3 , wherein the first plurality of lenslets and the second plurality of lenslets each comprise a square aperture shape, and wherein an aperture ratio of the first plurality of lenslets to the second plurality of lenslets is 4:1.

7 . The LED lamp of claim 3 , wherein the first plurality of lenslets and the second plurality of lenslets each comprise a hexagonal aperture shape, and wherein an aperture ratio of the first plurality of lenslets to the second plurality of lenslets is 3:1.

8 . The LED lamp of claim 3 , wherein the first plurality of lenslets and the second plurality of lenslets each comprise a circular aperture shape, and wherein an aperture ratio of the first plurality of lenslets to the second plurality of lenslets is 3:1 or 4:1.

9 . The LED lamp of claim 1 , wherein a curvature ratio of the first plurality of lenslets to the second plurality of lenslets is within a range of 1:10 to 1:9.

10 . The LED lamp of claim 1 , wherein the exit lens is formed from a material having a refractive index within a range of about 1.45 to about 1.65.

11 . The LED lamp of claim 1 wherein each of the plurality of LED strings produce a different output spectrum.

12 . The LED lamp of claim 11 wherein the LED strings are arranged to form an N-sided polygonal array on the surface of the substrate.

13 . The LED lamp of claim 12 , further comprising: a plurality of photodetectors that includes N photodetectors.

14 . The LED lamp of claim 13 wherein each of the N photodetectors is disposed at a midpoint of each respective side of the N-sided polygonal array formed by the plurality of LED strings.

15 . The LED lamp of claim 13 , further comprising an optical structure disposed on a surface of the substrate, wherein the optical structure encapsulates the plurality of LED strings and the plurality of photodetectors.

16 . The LED lamp of claim 15 wherein the optical structure comprises a hemispherical dome.

Continuity (9)

References Cited (400)