Abstract: A method of assembling the arc tube of a high-pressure sodium lamp is disclosed that comprises using a spring clip to engage the lead wire proximate the end plug on the side opposite the electrode coil assembly. The electrode coil assembly is thereby centered relative to the end plug and the three ends of the clip provide planar support of the end plug/electrode on the end of the arc tube. The clip is formed by bending a refractory metal wire 180.degree. about the midpoint, bending the ends of the legs away from each other while maintaining co-planar geometry, and providing an indentation for engaging the lead wire.

Abstract: An energy-saving instant-start series-sequence fluorescent lamp system includes power-reducing capacitor means connected in series circuit arrangement with one or both lamps in a two-lamp system. A protective device is connected in circuit with a first lamp of the system so that in the event the second lamp fails to operate and causes a high current to flow through the first lamp, the protective device reacts to prevent the system from being damaged. A lamp incorporating the power-reducing capacitor and protective device is also disclosed.

Abstract: Sintering aids are disclosed which improve the sintering of emission materials in high pressure discharge lamps. The sintering aid is Nb.sub.2 O.sub.5 or Ta.sub.2 O.sub.5 or a mixture thereof along with an alkaline earth oxide with is mixed in the amount of 2 to 15 weight percent sintering aid with 98 to 85 weight percent electron emissive material.

Abstract: A one piece spring latch having a camming surface engageable by the edge of a cooperating latching aperture to deflect the latch element until it passes through the aperture to latching position, the latch element then snapping into overlying latching engagement with the material forming the bounding edge of the latching aperture.The latch is particularly suitable for latching together substantially co-planar panels disposed closely adjacent to one another, as for example the diffuser frame and housing of a fluorescent lighting fixture, a portion of the latching device being of thin cross section and extending between the edges of the panels so that very little clearance between the adjacent panel edges is required. The latch includes release tabs which are physically small and are easily operable by finger pressure.

Abstract: A lighting fixture of square, rectangular or triangular shape consisting of a completely enclosed metal box within which the wiring and ballast transformers are contained, with integral portions of the box providing supports for one or more fluorescent lamps and thereby completely eliminating the need to secure to the body of the fixture separate support clips for the lamps. Reductions in material and manufacturing costs as well as shipping costs are realized because of reductions in material used, assembly time and physical size. The closed box configuration permits open suspension mounting, and the geometry is such that heat to which the ballasts are subjected is reduced.