1. IN COMBINATION, A CASING WITHIN WHICH IS ARRANGED (A) A POWER SOURCE, (B) SAID CASING HAVING A WALL HAVING FORMED THEREIN AN OPENING AND ELONGATED SLOT ADJACENT SAID OPENING, (C) A MOUNTING PLATE HAVING AN OPENING AND A SLOT FORMED THEREIN AND ARRANGED IN SAID CASING AGAINST SAID WALL WITH THE OPENING AND SLOT OF THE MOUNTING PLATE IN REGISTRATION WITH THE OPENING AND SLOT IN SAID WALL. (D) A LIGHTING FILAMENT ARRANGED IN THE CASING AND CARRIED BY THE MOUNTING PLATE TO THE REAR OF AND EXPOSED THROUGH SAID OPENING, (E) A SHUTTER PIVOTALLY CARRIED BY THE MOUNTING PLATE WITHIN THE CASING FOR CLOSING SAID OPENING TO CONCEAL SAID FILAMENT, (F) CIRCUIT MEANS FOR CONNECTING SAID FILAMENT WITH SAID POWER SOURCE, SAID CIRCUIT MEANS INCLUDING AS AN ELEMENT THEREOF SAID SHUTTER AND A CONTACT PLATE THE LATTER CARRIED BY SAID MOUNTING PLATE AND ENGAGEABLE BY THE SHUTTER WHEN THE SHUTTER IS MOVED FROM CONCEALED POSITION WITH RESPECT TO SAID FILAMENT, AND (G) A FINGER BUTTON CARRIED BY THE SHUTTER AND EXTENDING THROUGH AND OPERABLE IN SAID SLOT TO FACILITATE MOVING SAID SHUTTER FROM AND TO CONCEALING POSITION WITH RESPECT TO SAID FILAMENT.