Abstract: An all glass reflector having a front reflecting surface and terminating in the rear in a cavity into which a lamp is cemented transmits substantially less light out of the rear when at least the inside or the outside of the cavity and the reflecting surface are coated with an optical interference coating. The coating is applied by a low pressure chemical vapor deposition process.

Abstract: Optical interference coatings useful on lamps for transmitting visible light radiation at about 90% average from 400-770 nm and for reflecting infrared radiation comprise three spectrally adjacent multiperiod stacks of alternating high and low index of refraction layers. Compared to conventional filters, these filters have a greater tolerance to layer thickness variations incurred during manufacture with little or no color shift when viewed at non-normal angles.

Abstract: Tungsten metal powder of controlled particle sizes is obtained in a fluid bed process by reducing particles of tungsten oxide having the formula WO.sub.X where x is from 2.5 to 3.0. The WO.sub.X powder particles are heated to and then maintained at a temperature between 650.degree. and 1000.degree. C. in a reducing atmosphere, which is maintained by passing a mixture of hydrogen gas, water and optionally nitrogen gas through a fluid bed of the tungsten oxide particles until substantially all of the powder solid is tungsten dioxide, WO.sub.2. The ratio of water partial pressure to hydrogen partial pressure in the feed gas is equal to or slightly higher than the equilibrium partial pressure ratio. The flow of water vapor is then discontinued, either gradually or instantaneously, while maintianing the flow of hydrogen gas to reduce the WO.sub.2 to tungsten metal. By maintaining the ratio of water partial pressure to hydrogen partial pressure above the equilibrium value until the original WO.sub.

Abstract: A package for shipping fluorescent lamps comprising a rectangularly shaped first carton closed at both ends and containing said lamps within and being disposed inside a hexagonally shaped second carton or sleeve. The longitudinal axes of both cartons are parallel and two opposing sides of the first carton are parallel to and in proximate contact with the inside surface of two respective opposing sides of the second carton inside the second carton. The package contains two triangularly shaped and opposing cavities each of which contains a triangular shaped spacer to prevent rotation of the first carton within the second carton.

Abstract: A rectangular carton for shipping articles such as incandescent light bulbs and serving as a display base for the articles is formed from a unitary boxboard blank and has an integral, removable platform or false bottom within. This enables the carton to be of a sufficient height to serve as a base to display the articles and at the same time permits shipment of a quantity of articles substantially less than what the carton will hold without the need for fillers or extra packing materials.

Abstract: Improved tungsten coil filaments having good sag resistance and useful in double ended, high intensity and energy efficient tungsten halogen lamps having an IR reflecting filter on the filament chamber. These coil filaments have a microstructure which is a large, elongated and interlocking grain structure produced by a high temperature heat treatment process.

Abstract: Mercury condensation in dual phosphor layer fluorescent lamps is inhibited by mixing alumina particles having a median particle size not less than about one-half micron with the phosphor particles in the first phosphor layer which is disposed adjacent the inner lamp envelope surface.

Abstract: A mount for a minature lamp terminating at one end in an elongated tubular member, said mount comprising a base and a cap assembled in mating engagement and exerting a compressive force on at least one deformable, elastomeric tubular or ring shaped member in said mount which surrounds and contacts said tubular lamp member of which at least a portion of which is inserted in a bore in the mount, thereby holding the lamp in the mount.

Abstract: Tungsten-halogen lamps operating at temperatures above 250.degree. C. which contain a mixture of phosphine, hydrogen, bromine and inert gas have been found to have superior life and lumen maintenance when the atomic ratio of phosphorus to bromine in the lamp is in the range of from 0.4-2.5.

Abstract: An electric lamp fabricated from lamp tubing and terminating at one end in an elongated tubular portion which is of a precise, predetermined length with respect to the optical center of the lamp is inserted directly into and held in a bore in the rear of a reflector so that the optical center of the lamp is at the focal point of the reflector without need for adjusting the position of the lamp in the reflector.

Abstract: An elongated tubular lamp such as an arc lamp or tungsten halogen lamp mounted in a reflector or lamp mount by means of a long and a short mount wire is more resistant to breaking off the mount wires if the short mount wire is smaller in diameter than the long mount wire, but not smaller than the diameter of the lamp lead wire to which it is welded in combination with the lamp lead wire being molybdenum alloy having a recrystallization temperature at least about 200.degree. C. higher than molybdenum.

Abstract: Metal halide vapor arc lamps for reprographic and projection processes emitting in the blue, green and red bands with excellent primary color separation and having long life and lumen maintenance contain mercury, zinc, indium, lithium, thallium, a halogen and a rare earth metal such as lanthanum, scandium or dysporsium in the arc tube.

Abstract: A package for shipping fluorescent lamps comprising a rectangularly shaped first carton closed at both ends and containing the lamps within and being disposed inside a second rectangularly shaped carton with the longitudinal axis of both cartons parallel and the first carton being rotated inside the second carton such that the four longitudinal sides of the first carton contact the respective side wall inside the second carton to form four triangularly shaped cavities and wherein two of the cavities contain a triangularly shaped spacer to prevent rotation of the first carton within the second carton.

Abstract: Metal halide vapor arc lamps for reprographic and projection processes emitting in the blue, green and red bands with excellent primary color separation and having significant blue emission at a wavelength of about 450 nm, contain a fill of indium, zinc, lithium and thallium iodides.

Abstract: Sockets for receiving metal lamp bases of electric lamps which contain metal parts fabricated from certain relatively high copper and low zinc content copper alloys are resistant to corrosion and to corrosion cracking in corrosive environments.

Abstract: Thin film interference filters consisting of alternating layers of tantala and silica suitable for high temperature use on electric lamps have been made by heat treating at 550.degree.-675.degree. C. before using the filters at high temperature. Tungsten halogen lamps made with such heat treated filters have been thermally cycled for thousands of cycles at 900.degree. C. with no film loss and with satisfactory optical performance.

Abstract: A spud made of refractory metal wire in the shape of a ring with a loop on each side radially aligns and provides electricity to a filament in a double ended tungsten halogen lamp. The spud has a leg extending from the end of each loop, one of which is attached to the filament and the other forming part of an inlead assembly. This spud is particularly useful with relatively small size double ended tungsten-halogen lamps having an infrared reflecting coating on the surface of the vitreous filament chamber.