US Patent 7364325 Lamp structure

A lamp structure is constructed to include a transparent opencell housing with a predetermined wall thickness. The housing includes an inner mirror layer and an outer mirror layer respectively coated on the inner and outer surfaces thereof. A light admitting face in the outside peripheral rim thereof neighbors the mirror layers, and a light source installed in a lamp socket is formed integral with the housing and controlled to emit light into the predetermined wall thickness, for enabling light rays to be mutually reflected between the mirror layers and guided toward the light admitting face in the outside peripheral rim of the housing to form a light ring.