CPC F21V 5/005 (2013.01) [F21Y 2115/10 (2016.08)] | 11 Claims |
1. A light transmissive substrate for transforming a Lambertian light distribution into a batwing light distribution, the light transmissive substrate comprising:
a) a substrate comprising a first surface comprising a plurality of microstructures forming an array having rows and columns and comprising a second surface on a side of the substrate opposite to the first surface, wherein each of the plurality of microstructures has a shape of a pyramid having a roof angle that extends in a direction away from the second surface, the substrate configured to receive light in a Lambertian distribution from a light source at the first surface and configured to transform the light into a three-dimensional batwing distribution exiting the second surface,
wherein the roof angle is chosen to provide a desired intensity at nadir and a desired shape of the three-dimensional batwing distribution.
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