Abstract: Improved fuse elements used with the circuit board to provide more reliable sequential firing in a flash lamp array. The circuit board includes a lamp firing circuitry along with radiation switches connected in said circuitry and more reliable fuse elements cooperate with said radiation switches in the circuit operation. The improved fuse elements are constructed as an integral part of the lamp firing circuit pattern deposited on the circuit board at circuit locations wherein the underlying circuit board substrate has a thickness less than the substrate thickness elsewhere to enhance melting or thermal decomposition of the circuit board substrate.

Abstract: Floodlight with elongated high intensity lamp, such as a quartz iodine lamp, having an improved socket mounting. The fixture includes a reflector having openings at opposite sides through which the lamp electrode ends pass for engaging lamp sockets which are mounted in operative position on the fixture housing solely by sheet metal springs.

Abstract: Improved mechanical stop means are provided for a sealed prefocused light source mount for a parabolic aluminized reflector (PAR) lamp and, in particular, to improved mechanical stop means for an all-plastic PAR lamp or a PAR lamp comprising a plastic reflector. The particular mount construction employed utilizes a plastic block having mating parts which define a cavity from which lead wires extend and which is filled with an elastomeric polymer providing both a leak-proof seal around the lead wires as well as a more reliable barrier to moisture leakage through the mount assembly. An exterior surface of said plastic block limits insertion of the assembled lamp unit into a conventional plug-in receptacle used to supply electrical power to the lamp.

Abstract: Electrical capacitor has guard placed over its external terminals to provide space for displacement of the terminals in the operation of the internal pressure sensitive interrupter device when the capacitor is embedded by encapsulating material in an electrical ballast container.

Abstract: An improved sealing means is provided for a sealed prefocused light source mount for a parabolic aluminized reflector (PAR) lamp and, in particular, to improved leak-proof sealing means for an all-plastic PAR lamp or a PAR lamp comprising a plastic reflector. The improved mount construction utilizes a plastic block having mating parts which define a cavity from which lead wires extend and which is filled with an elastomeric polymer providing both a leak-proof seal around the lead wires as well as a more reliable barrier to moisture leakage through the mount assembly.

Abstract: A modified gilsonite based coil impregnant having improved sound suppression properties and rheologically controlled characteristics. In one form of the preferred embodiment, the gilsonite is modified by thermal depolymerization. In another form of the preferred embodiment, the gilsonite is modified by the addition of a process oil having a viscosity gravity constant of 0.97 and a viscosity in SSU at 100.degree. C. of 48.4 and comprising 29-36% by weight of the oil-gilsonite composition. To approximately 75-80% of modified gilsonite is added about 20-25% by weight of ethylenediamine bisstearamide to produce a mixture having a softening point of from 125.degree.-130.degree. C. and a viscosity at 170.degree. C. of from 78 to 118 centipoise.

Abstract: A novel frit glass composition is disclosed which is particularly useful to color the soda-lime glass envelopes of incandescent lamps. Specifically, the present glass frit can be combined with various colored oxides to produce the colored coating when fired on the surface of the lamp glass envelope. The glass frit has a composition expressed in terms of weight percent, based on the starting batch formulation, as follows:______________________________________ SiO.sub.2 18-25 TiO.sub.2 0-5 ZrO.sub.2 7-12 ZnO 18-21 BaO 4-6 CaO 4-6 Na.sub.2 O 2-4 K.sub.2 O 6-8 B.sub.2 O.sub.3 15-22 Al.sub.2 O.sub.

Abstract: A portable swivel base lighting fixture comprising a housing, a two-component base and a connecting arm which supportively attaches housing to the base. The base includes an outer or cover member which recessively surrounds an inner member. The outer and inner members are rotationally operable relative to each other to permit rotational positioning of the lamp.

Abstract: A jacketed metal halide discharge lamp combining a miniature arc tube containing sodium iodide and a standby filament within an outer envelope, is provided with a glass sleeve around the arc tube. The glass sleeve is preferably connected to a point of potential which is positive relative to the arc tube, suitably the anode when the arc is operated on d.c. The glass sleeve prevents sodium loss from the arc by trapping ultraviolet light and by shielding the arc from photoelectrons. The sleeve serves also to reduce color shift when the arc tube is switched over from "high" to "low", and to protect the outer bulb in the event of arc tube rupture.

Abstract: Indoor lighting fixture provides semi-indirect symmetrical light distribution. The fixture comprises a central support tube attached to the ceiling at its upper end and having a high intensity gaseous discharge lamp at its lower end projecting into a box-like housing having a semi-transparent variable transmission lens on its bottom and an interior reflector extending around the lamp for reflecting light rays upwardly toward the ceiling. Vertically spaced louvers arranged encircling the upper portion of the lamp serve to shield the lamp from direct view of the room occupants to avoid glare.

Abstract: A heat shield is disclosed for rectangular PAR lamps in which the shield is mechanically attached to the roof of the lamp by two rails into which the shield slides.

Abstract: A circular fluorescent lamp unit having a central hub containing a ballast reactor and provided with a screw base. A replaceable circular lamp assembly is positioned around the hub and has a slide connector for electrically and mechanically connecting the lamp assembly to the hub.