An illuminating apparatus has a transparent or semitransparent optical medium in the form of an acrylic plate, two fluorescent tubes for emitting light into the acrylic plate through opposite end surfaces thereof, and a reflecting plate disposed under a lower surface of the acrylic plate for upwardly...http://www.google.de/patents/US5386347?utm_source=gb-gplus-sharePatent US5386347 - Illuminating apparatus and a method of manufacturing an edge light conductor for use therein
