US 11,947,151 B2
Homogeneous color LED lighting device with wavelength dependent modifier on output surface of lightguide
James Gourlay, Livingston (GB); and Marius Jankauskas, Livingston (GB)
Assigned to Design LED Products Limited, Livingston (GB)
Appl. No. 17/917,635
Filed by DESIGN LED PRODUCTS LIMITED, Livingston (GB)
PCT Filed Apr. 8, 2021, PCT No. PCT/GB2021/050858
§ 371(c)(1), (2) Date Oct. 7, 2022,
PCT Pub. No. WO2021/205168, PCT Pub. Date Oct. 14, 2021.
Claims priority of application No. 2005328 (GB), filed on Apr. 9, 2020.
Prior Publication US 2023/0185012 A1, Jun. 15, 2023
Int. Cl. F21V 8/00 (2006.01); B60G 3/00 (2006.01)
CPC G02B 6/0036 (2013.01) [G02B 6/0025 (2013.01); G02B 6/0068 (2013.01); G02B 6/0073 (2013.01); B60G 3/00 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A lighting device comprising:
one or more LED packages having at least first and second spatially separated LED chips, the first LED chip configured to generate a light output at a first wavelength, the second LED chip configured to generate light at a second wavelength different from the first wavelength;
a light guide receiving light from the one or more LED packages, and emitting the received light from a light output surface;
at least one first wavelength dependent modification feature located on a first area of the light output surface and configured to selectively modify an intensity of the light of the first LED chip; and
at least one second wavelength dependent modification feature located on a second area of the light output surface, and configured to selectively modify an intensity of the light output of the second LED chip,
wherein at least a portion of the light outputs from the first and second LED chips exit the light guide via the light output surface, such that the lighting device provides a homogeneous color light output.