CPC F21V 5/005 (2013.01) [F21Y 2115/10 (2016.08)] | 25 Claims |
1. A light transmissive substrate for transforming a Lambertian light distribution into a batwing light distribution, the light transmissive substrate comprising:
a first surface comprising a plurality of microstructures; and
a second surface on a side of the substrate opposite the first surface, wherein each of the plurality of microstructures has a shape of a pyramid with a roof angle of between about 70° and about 95° and extending in a direction away from the second surface,
wherein the substrate is configured to receive light in a Lambertian distribution from a light source at the first surface and transform the light into a three-dimensional batwing distribution exiting the second surface, the three-dimensional batwing distribution having peak intensities at angles ranging from ±30° to about ±60° from X and Y axes and a desired intensity at nadir that is less than at least one of peak intensities and, wherein a refractive index of the microstructures and the roof angle are chosen to provide a desired shape of the three-dimensional batwing distribution and the desired intensity at nadir.
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