Spring of diffusing light (Machine-translation by Google Translate, not legally binding)

摘要

Diffuse light source, essentially characterized by comprising a ceramic plate on the back face of which there is a conductive coating, and on its front face an electroluminescent phosphor coating, excitable by the passage of the alternating current through the conductive coating transforming the energy electric in light, and presenting this set a transparent covering of protection in fire-retardant material. (Machine-translation by Google Translate, not legally binding)