Abstract: In a cathodoluminescent lamp of the type having an electrically conductive coating forms the anode on the interior surface of the bulb wall, a phosphor coating overlies the anode coating and an electron emissive cathode below a grid, the lead to the anode passes through a glass tube, additional to the exhaust tube, incorporated in the pinched foot tube, and is sealed through the pinch, and the contact between the anode lead and the anode coating on the bulb is provided by a bent metal strip attached to envelope the neck and partially covered by the anode coating, which extends partly down the neck, the end of the anode lead being engaged with an upstanding portion of the contact strip.

Abstract: A cathodoluminescent lamp for use for general lighting service includes an anode constituted by an electrically conducting coating, which may be partly internally reflective, on the interior surface of the bulb wall, a phosphor coating over the whole of the bulb wall interior, a dome-shaped metal mesh grid located near the junction of the bulb with the envelope neck and supported on a hollow metal cylinder, and an electron emissive cathode mounted within the grid/cylinder assembly. The cathode may be a "wreath" filament or indirectly heated disc located near the grid, or a linear filament located near the open end of the cylinder remote from the grid. In the latter case a metal disc, connected to the negative lead to the cathode, is located near the open end of the cylinder, to repel electrons emerging therefrom. A circuit, which may be incorporated in the lampholder, converts the supply to unidirectional operating voltages applied to the anode, grid and cathode.

Abstract: In a high pressure electric discharge lamp having tungsten electrodes and a discharge envelope filling of mercury, rare gas, and metal halides, activator material consisting essentially of scandium oxide is incorporated in the electrodes, in the form of a solidified melt substantially filling a cavity in the electrode and adherent to the electrode structure, and the halides of the filling consist of iodide(s) and bromide(s), including scandium iodide and/or scandium bromide, in relative proportions such that the atomic ratio of total bromine to total iodine is 20:80 to 60:40. The electrodes are preferably tungsten wire coils, the scandium oxide filling the interior of the coil and penetrating into the interstices between the coil turns. The filling preferably includes sodium iodide and/or sodium bromide, and may include additional iodides and/or bromides. The combination of the scandium oxide activator and the bromide/iodide filling gives high luminous efficacy and good lumen maintenance.