1. An optical structure for processing the light output by a lighting unit, comprising:an optical layer including:
a translucent plate having an inner surface and an outer surface; and
a first beam processing structure for optically processing a light output, the first beam processing structure including at least one collimator or reflector arranged at the inner surface of the translucent plate to direct the light output through the optical layer;
said translucent plate comprising at least one region, wherein the entirety of the at least one region is laterally offset from the first beam processing structure in a first direction; and
circuitry or a chip connected to the inner or outer surface of the translucent plate and arranged entirely within the at least one region; or, the circuitry or the chip integrated and arranged entirely within the translucent plate in the at least one region.