Patent ID: 9534741
Date: 2017-01-03
CPC Classifications: F21K,F21S,F21V,F21Y,H01L

Claim:
1. A lighting device comprising: at least one electrically activated light emitter; a first light-emitting region arranged to transmit or reflect at least a first portion of emissions of the at least one electrically activated light emitter in a first direction, wherein the at least a first portion of emissions comprises a first gamut area index (GAI) value; and a second light-emitting region arranged to transmit or reflect at least a second portion of emissions of the at least one electrically activated light emitter in a second direction, wherein the at least a second portion of emissions comprises a second gamut area index (GAI) value; wherein the second GAI value differs from the first GAI value by at least 10%; and wherein the lighting device comprises at least one of the following features (i) to (v): (i) at least one of the first light-emitting region or the second light-emitting region comprises at least one light-affecting material arranged to increase gamut area index, and at least one of composition, concentration, thickness, or patterning of the at least one light-affecting material differs among the first light-emitting region and the second light-emitting region; (ii) the first light-emitting region comprises a first lumiphoric material, and the second light-emitting region comprises a second lumiphoric material that comprises a different dominant wavelength than the first lumiphoric material; (iii) the at least one electrically activated light emitter comprises at least one first electrically activated light emitter arranged to provide the first portion of emissions to the first light-emitting region, and comprises at least one second electrically activated light emitter arranged to provide the second portion of emissions to the second light-emitting region, wherein the at least one first electrically activated light emitter is arranged to produce spectral output having a gamut area index (GAI) value that exceeds a corresponding GAI value of spectral output produced by the at least one second electrically activated light emitter; (iv) at least one transition region is arranged between the first light-emitting region and the second light-emitting region, wherein the at least one transition region is arranged to provide a gradient, feathered, or sawtooth transition of gamut area index values between the first light-emitting region and the second light-emitting region; (v) the first portion of emissions, in an absence of any additional light, embodies a first color point; the second portion of emissions, in the absence of any additional light, embodies a second color point; and one of the first color point or the second color point has (x, y) coordinates on a 1931 CIE Chromaticity Diagram that define a point on or within 7 MacAdam ellipses of a white body locus embodying a line including segments defined by the following x, y coordinates on a 1931 CIE Chromaticity Diagram: (0.3114, 0.3386) to (0.3462, 0.3631), (0.3462, 0.3631) to (0.3777, 0.3790), (0.3777, 0.3790) to (0.3977, 0.3707), (0.3977, 0.3707) to (0.4211, 0.3713), and (0.4211, 0.3713) to (0.4437, 0.3808).