An improved wall plate incorporating an electroluminescent lamp for providing illumination to the immediate area proximate the wall plate. The electroluminescent (EL) panel is activated and deactivated by a photoconductive cell, in response to the intensity of ambient light falling...http://www.google.se/patents/US5670776?utm_source=gb-gplus-sharePatent US5670776 - Electroluminescent wall plate and switch
