SYSTEMS FOR UNIFORM LED LIGHTING
In accordance with certain embodiments, groups of light-emitting elements having different distributions in one or more optical characteristics are utilized to provide direct and indirect illumination.
1 . A lighting system comprising:
a flexible substrate;
a first group of light-emitting elements (LEEs) disposed on the substrate and having a first distribution of correlated color temperature (CCT); and
a second group of LEEs disposed on the substrate and having a second distribution of CCT different from the first distribution of CCT,
wherein the substrate is shaped such that the first group of LEEs and the second group of LEEs are not simultaneously observable.
2 . The lighting system of claim 1 , wherein the substrate is shaped such that the first group of LEEs is not directly visible by an observer directly observing the second group of LEEs.
3 . The lighting system of claim 1 , wherein light emitted by the first group of LEEs is emitted in a first direction substantially different from a second direction in which light is emitted by the second group of LEEs.
4 . The lighting system of claim 3 , further comprising a reflective surface positioned to reflect light emitted by the first group of LEEs, thereby producing reflected light propagating in the second direction.
5 . The lighting system of claim 4 , wherein the reflective surface comprises a portion of a structure to which the lighting system is attached.
6 . The lighting system of claim 4 , wherein the reflective surface comprises a portion of the lighting system.
7 . The lighting system of claim 1 , wherein both the first and second groups of LEEs are mounted on the same surface of the substrate.
8 . The lighting system of claim 1 , wherein the first group of LEEs is disposed on a first surface of the substrate and the second group of LEEs is disposed on a second side of the substrate opposite the first side of the substrate.
9 . The lighting system of claim 1 , wherein an average CCT of the first group of LEEs is within four MacAdam ellipses of an average CCT of the second group of LEEs.
10 . The lighting system of claim 1 , wherein an average CCT of the first group of LEEs is within two MacAdam ellipses of an average CCT of the second group of LEEs.
11 . The lighting system of claim 1 , wherein an average CCT of the first group of LEEs is approximately equal to an average CCT of the second group of LEEs.
12 . The lighting system of claim 1 , wherein the first distribution of CCT is within ten MacAdam ellipses of an average CCT of the first group of LEEs.
13 . The lighting system of claim 1 , wherein the second distribution of CCT is within three MacAdam ellipses of an average CCT of the second group of LEEs.
14 . The lighting system of claim 1 , wherein the first distribution of CCT is within twenty MacAdam ellipses of an average CCT of the first group of LEEs and the second distribution of CCT is within four MacAdam ellipses of an average CCT of the second group of LEEs.
15 . The lighting system of claim 1 , wherein the first distribution of CCT is at least three times as large as the second distribution of CCT.
16 . The lighting system of claim 1 , wherein the first distribution of CCT is at least 1.5 times as large as the second distribution of CCT.
17 . The lighting system of claim 1 , further comprising a third group of LEEs having a third distribution of CCT that is substantially the same as the first distribution of CCT.
18 . The lighting system of claim 1 , further comprising a third group of LEEs having a third distribution of CCT that is substantially the same as the second distribution of CCT.
19 . The lighting system of claim 1 , wherein the substrate is curved such that the light emitted by the first group of LEEs is emitted in a substantially different direction than the light emitted by the second group of LEEs.
20 . The lighting system of claim 1 , wherein the substrate is folded such that the light emitted by the first group of LEEs is emitted in a substantially different direction than the light emitted by the second group of LEEs.
21 . The lighting system of claim 1 , further comprising an optic disposed over at least a portion of at least one of the first group of LEEs or the second group of LEEs.
22 . The lighting system of claim 21 , wherein the optic comprises at least one of a diffuser, a refractive optic, a reflective optic, a total internal reflection optic, or a Fresnel optic.
23 . A lighting system comprising:
a flexible substrate;
a first group of light-emitting elements (LEEs) disposed on the substrate and having a first distribution of at least one optical characteristic; and
a second group of LEEs disposed on the substrate and having a second distribution of the at least one optical characteristic different from the first distribution of the at least one optical characteristic,
wherein the substrate is shaped such that the first group of LEEs and the second group of LEEs are not simultaneously observable.
24 . The lighting system of claim 23 , wherein the substrate is shaped such that the first group of LEEs is not directly visible by an observer directly observing the second group of LEEs.
25 . The lighting system of claim 23 , wherein the optical characteristic comprises at least one of correlated color temperature (CCT), color rendering index (CRI), R9, or light intensity.