Abstract: A ceiling mounted support structure for mounting light fixtures, louvers, and the like, including at least one support piece mounted or supported by at least one building ceiling support, the piece having an elongate slot therein in which an enlarged end of a flipper bar rotates. The flipper bar rotates upwardly to permit the fixture part to be supported to pass upwardly therepast and rotates downwardly to provide the in-place support for the fixture part.

Abstract: A dimmer circuit for an HID lamp is provided for supplying a square wave current therethrough at a constant frequency, but whose duty cycle is variable dependent on a sensed current level. The circuit employs a first pair of transistor switches for reversing polarity through the lamp at a low frequency rate. Associated with each of those transistors is a circuit having a transistor switch connected to a drive circuit employing a timer network. The timer network produces an output that is a square wave, the leading edge of which occurs at regular intervals at a high frequency rate. The trailing edge occurs dependent on a dim/bright voltage setting and upon the amount of current through a sensing resistor in series with the lamp.

Abstract: A circuit for providing remote control at a plurality of locations for a lighting system, such control functions including on/off, dimming intensity and rate of dimming. Visual indication of take control is also provided.

Abstract: A protection circuit for producing one or more triggers in the presence of a monitored overvoltage condition employing photodiode networks for sensing the voltage overload, phototransistors responding to the photodiode outputs and operating gated semiconductors, which, in turn, discharge capacitors for trigger production. Separate networks are provided for each ac polarity operation. Monitoring may be with respect to supply voltage, power supply output voltage or one or more independent voltages.

Abstract: A high frequency drive circuit operating as a push-pull, Class C oscillator for driving a high-intensity, gaseous discharge lamp and avoiding the use of a relatively large ballast coil. A highly stable power supply for operating in conjunction with such circuit is also provided.

Abstract: Circuits are disclosed for use in a gaseous-discharge lamp lighting system which provide starting pulses to the lamp and/or a source of auxiliary light. One circuit provides starting pulses and/or auxiliary light until the gaseous-discharge lamp approaches its normal operating condition, while other circuits terminate these functions once the gaseous-discharge lamp ignites.

Abstract: A permanent type closure for securing a thin film lens on a light fixture which is entered from the rear for replacement purposes including a preferably metallic band and gasket.

Abstract: This invention pertains to an emergency lighting circuit that operates with a high pressure, gaseous-discharge lamp and associated ballast. When the gaseous-discharge lamp goes out, after once being ignited, sufficient current is supplied to an incandescent light or lights to maintain illumination to the area normally illuminated by the lamp. The device for providing this current may vary, but generally incorporates a voltage breakdown means that receives higher voltage from the ballast when there is failure of the gaseous-discharge lamp than when the arc therein is struck. A preferred embodiment also lights the incandescent lights during initial warm-up of the gaseous-discharge lamp. The incandescent lights may also be used in a cold environment to maintain the gaseous-discharge lamp sufficiently above an ambient temperature level to make possible initial striking of the arc in the lamp when ambient temperature conditions might otherwise prevent it.

Abstract: There is disclosed a light fixture having a ballast mounted on the housing thereof by means of a metal bracket having side walls which are connected to one another to form a corner and a base wall connected to each of the side walls intermediate their opposite ends. The side walls of the bracket are secured to adjacent metal side walls of the housing which are connected to one another at a corner thereof, and the ballast is releasably connected to the base wall of the bracket.

Abstract: This invention pertains to an emergency lighting circuit that operates with a high pressure, gaseous-discharge lamp and associated ballast. When the gaseous-discharge lamp goes out, after once being ignited, sufficient current is supplied to an incandescent light or lights to maintain illumination to the area normally illuminated by the lamp. The device for providing this current may vary, but generally incorporates a voltage breakdown means that receives higher voltage from the ballast when there is failure of the gaseous-discharge lamp than when the arc therein is struck. A preferred embodiment also lights the incandescent lights during initial warm-up of the gaseous-discharge lamp. The incandescent lights may also be used in a cold environment to maintain the gaseous-discharge lamp sufficiently above an ambient temperature level to make possible initial striking of the arc in the lamp when ambient temperature conditions might otherwise prevent it.

Abstract: A luminaire including a segmented and faceted reflector of two sections describing a concave surface but approximately describing a plurality of paraboloid surfaces of revolution. With simple repositioning of the two reflector sections, a range of reflected beam widths may be achieved. The construction of the reflector sections provides economic fabrication without material reshaping or working and hence dulling of highly reflective material, the fabrication steps including V-notching and bending in two directions.

Abstract: An automatically variable d.c. voltage source supplies a control signal to a dimmer circuit that controls the brightness of a high intensity gas discharge lamp in response to a varying d.c. voltage. The automatically variable d.c. voltage source produces a varying d.c. voltage at its output which is functionally related to the difference between a voltage from a stable reference voltage source and a voltage produced by a photocell circuit which is responsive to the light level of an area illuminated by the lamp controlled by the dimmer circuit. The variable d.c. source includes circuitry for indicating relamping conditions.

Abstract: There is disclosed a light fixture having a ballast therein comprising a substantially enclosed steel case which is mounted on a wall of the steel housing of the fixture and substantially filled with a potting compound in which a magnetic core and coil device is embedded.

Abstract: A mounting bracket for a lamp fixture fixedly securable to a mounting pad on the fixture via a key-hole slot arrangement and providing adjustment for the fixture through an aiming range of nearly 180.degree..

Abstract: An enclosed, box-like housing for a light fixture which is made up of a skeleton frame comprising elongate frame members having their ends connected by corner fittings to form openings between opposite pairs of the frame members, and panels held in place over the openings by elongate strips releasably connected to the frame members about the openings.

Abstract: A spring-loaded, plunger-type unit operating within a recess about a window panel in a luminaire and its housing. Preferable two such units operate within one recess and two other such units operate in an opposite parallel recess so that either pair may be operated as latches while the other pair operate as hinges. Alternatively, all four may operate as latches to permit removal of the panel. The units are substantially flush to conform to the outline of the luminaire, but are easily operable without special tools.

Abstract: A lighting system for gaseous-discharge lamps for applying high voltage pulses to ignite the lamp and for discontinuing the application of high voltage pulses when the lamp is operating. The system includes ballast facilities having an inductive portion, and a control circuit which is responsive to a voltage induced in the inductive portion when the gaseous-discharge lamp operates. When the control circuit is operative, the pulsing portion of the system is disabled. The system is arranged so that the components of the control and pulsing circuits are not subjected to the application of high voltage pulses at any time.