Abstract: A method and system are provided for transferring a load between a primary power source and a secondary power source. In accordance with the disclosure, a controller senses, via a sensor, an electrical signal providing power from the primary power source to the load. The controller also detects a non-conforming power event by determining that a parameter of the electrical signal is either more or less than a first threshold value. Responsive to the detection of the non-conforming power event, the controller determines a quantity of non-conforming power events that occur during a first time interval. The controller further can compares the determined quantity of non-conforming power events to a second threshold value. Responsive to the determined quantity of non-conforming power events being either greater or lesser than the second threshold value, the controller initiates a control signal, such as a control signal to initiate a load transfer.

Abstract: A method and system are provided for transferring a load between a primary power source and a secondary power source. In accordance with the disclosure, a controller senses, via a sensor, an electrical signal providing power from the primary power source to the load. The controller also detects a non-conforming power event by determining that a parameter of the electrical signal is either more or less than a first threshold value. Responsive to the detection of the non-conforming power event, the controller determines a quantity of non-conforming power events that occur during a first time interval. The controller further can compares the determined quantity of non-conforming power events to a second threshold value. Responsive to the determined quantity of non-conforming power events being either greater or lesser than the second threshold value, the controller initiates a control signal, such as a control signal to initiate a load transfer.

Abstract: An appliance unit (3) is for electrical connection in series to a control unit (1) and to a power supply via the control unit (1). The appliance unit (3) comprises an appliance module comprising at least one controllable light generating module (23) and/or at least one controllable auxiliary module (25) for performing functionality other than light generating, and a control module (27) for negotiating a power mode for the appliance unit (3) with the control unit (1). The appliance module is controlled based on the power mode. A bypass module (21) is able to pass current through the appliance unit (3), such that the bypass module (21) is configured to pass a current to enable the control unit (1) to be powered separately from any current passed by the at least one controllable light generating module (23) and the at least one controllable auxiliary module (25).

Abstract: A micro lighting device includes a source line, a ground line, a main LED, and a redundant LED. The main LED includes a first electrode and a second electrode, and the redundant LED includes a third electrode and a fourth electrode. When the main LED is able to light up, the first electrode is electrically connected to the source line, the second electrode is electrically connected to the ground line, and at least one of the third electrode and the fourth electrode is electrically isolated from both the source line and the ground line. When the main LED is unable to light up, at least one of the first electrode and the second electrode is electrically isolated from both the source line and the ground line, the third electrode is electrically connected to the source line, and the fourth electrode is electrically connected to the ground line.

Abstract: This disclosure describes systems and techniques for managing streetlights. The subject matter included in this document is embodied in a method that includes receiving, at a computing device, information representative of a location and status of a streetlight included in a network of streetlights. The method also includes presenting a representation of the streetlight in a graphical user-interface in accordance with the received location and status information, and receiving information representing a selection of the streetlight for inclusion in a group of streetlights from the network. The method further includes initiating delivery of one or more control signals to the group of streetlights.

Abstract: An apparatus for extending the useful life of an ion source, comprising an arc chamber containing a plurality of cathodes to be used sequentially and a plurality of repellers to protect cathodes when not in use. The arc chamber includes an arc chamber housing defining a reaction cavity, gas injection openings, a plurality of cathodes, and at least one repeller element. A method for extending the useful life of an ion source includes providing power to a first cathode of an arc chamber in an ion source, operating the first cathode, detecting a failure or degradation in performance of the first cathode, energizing a second cathode, and continuing operation of the arc chamber with the second cathode.

Abstract: A data center inside a shipping container having a lower plenum and an upper plenum in its interior. Heated air in the upper plenum exits therefrom into a plurality of heat exchangers adjacent thereto. Air cooled by the heat exchangers travels toward and enters the lower plenum. The data center includes a plurality of carriages each having an equipment receiving portion located between an open bottom portion in open communication with the lower plenum, and an open top portion in open communication with the upper plenum. Fans inside each of the carriages draw cooled air up from the lower plenum into the open bottom portion of the carriage, blow the cooled air up through the equipment receiving portion thereby cooling any computing equipment received therein, and vent the cooled air through the open top portion into the upper plenum.

Abstract: The present invention provides a passive LC ballast and an associated method of manufacturing a passive LC ballast for use with any one of a plurality of high voltage discharge lamps. The passive LC ballast has an inductance and a capacitance selected in accordance with one of a set of one or more inductance-capacitance pairs. Each inductance-capacitance pair defines a respective inductance and a respective capacitance such that, when the inductance and the capacitance of the passive LC ballast is selected in accordance with any one of the inductance-capacitance pairs and the passive LC ballast is used with any one of the lamps, the lamp operates between respective minimum and maximum lamp powers of the lamp.

Abstract: The present invention includes one embodiment containing an LED lighting assembly containing: a troffer; a bulbless and/or tubeless sub-housing; one or more solid state lighting units contained within the troffer and actuated by alternating current power; a night light contained within the bulbless sub-housing and operably communicating with the solid state lighting units, the night light actuated in the absence of light from the solid state lighting units; one or more light emitting diodes contained within the night light; and a battery source for powering the night light in the event of power interruption. In yet another embodiment of the invention, a replaceable lighting unit contains: a bulbless and/or tubeless sub-housing. One or more light emitting diodes are contained within the sub-housing. A battery source may be contained within the sub-housing, and the battery source may be configured to selectively power the light emitting diodes with direct current energy.

Abstract: A method for using an electronic ballast circuit configured to operate a high intensity discharge (HID) lamp. Multiple light emitting diodes (LEDs) are attached to the current output of the electronic ballast circuit, and current is driven from the current output to light said LEDs. Optionally, prior to driving current through the LEDs, the impedance of the current output is sensed; and the current is driven through the LEDs to light the LEDs upon detection of an impedance significantly lower than an impedance characteristic of the HID lamp. Ignition appropriate to ignite the high intensity discharge is not performed when LEDS are attached to the current output. Alternatively, a signal is provided to disconnect the LEDs during a high voltage output for ignition of the high intensity discharge (HID) lamp.

Abstract: A lighting device includes a light emitting diode (LED) lamp, a power generating panel that is disposed at a position where the power generating panel is capable of receiving sunlight and light irradiated by the LED lamp and that is configured to generate electric power by receiving the sunlight and the light irradiated by the LED lamp, a storage battery that is configured to store the electric power generated by the power generating panel and to supply the electric power to the LED lamp, a lamp drive portion that is configured to drive the LED lamp using pulse signals, a remaining amount detection portion, and a control portion that is configured to control, in accordance with the remaining amount detected by the remaining amount detection portion, a pulse width and a period that are used when the lamp drive portion drives the LED lamp.

Abstract: A driving apparatus for a fluorescent tube and a method thereof and an illumination apparatus using the same are provided. The driving apparatus stops providing power, when a fluorescent tube has broken, to both ends of the broken fluorescent tube regardless of whether a power switch related to the fluorescent tube is in ON or OFF state, and thus making sure that a person is under a safety condition without getting an electric shock during replacing the broken fluorescent tube; moreover, the driving apparatus automatically detects the newly installed fluorescent tube and automatically light up the newly installed fluorescent tube after the broken fluorescent tube is replaced and it is unnecessary to switch the power switch related to the fluorescent tube anymore, and thus avoiding a potentially hazard for the person who climbs up and down a ladder repeatedly.

Abstract: Disclosed are LED backlight subassemblies and LCD displays making use thereof. The backlight subassembly includes at least one string of serially connected LEDs in which single LED failures do not lead to a partial or complete loss of image content.

Abstract: A lighting device includes a light emitting diode (LED) lamp, a power generating panel that is disposed at a position where the power generating panel is capable of receiving sunlight and light irradiated by the LED lamp and that is configured to generate electric power by receiving the sunlight and the light irradiated by the LED lamp, a storage battery that is configured to store the electric power generated by the power generating panel and to supply the electric power to the LED lamp, a lamp drive portion that is configured to drive the LED lamp using pulse signals, a remaining amount detection portion, and a control portion that is configured to control, in accordance with the remaining amount detected by the remaining amount detection portion, a pulse width and a period that are used when the lamp drive portion drives the LED lamp,

Abstract: The invention relates to an LED tube system for driving at least one LED assembly comprising: an LED tube housing for containing the at least one LED assembly, two pairs of mains input terminals (A, B) provided at ends of the LED tube housing for receiving a mains supply voltage (Vmns) and for supplying the mains supply voltage (Vmns) to an internal part of the LED tube system for driving the at least one LED assembly, and further comprising a switching circuit being electrically connected with all mains input terminals (A, B, C, D) and being arranged for electrically connecting the pairs of mains input terminals together in a first state (2/ON) and electrically separating the pairs in a second state (1/OFF) of the switching circuit. The switching circuit being further arranged for providing a coupling capacitor (C10, C11) between the first pair and the second pair of input terminals in the first state (2/ON) and removing the coupling capacitor (C10, C11) in the second state (1/OFF) of the switching circuit.

Abstract: A device for supplying a plurality of LED units with power includes a common DC/DC converter which delivers a regulated output voltage and to which a plurality of sections are connected, each having a buck converter and an LED unit connected thereto, and means for regulating or setting the section currents to be supplied to the LED units. In order to simplify the device, the means for regulating or setting the section currents are formed by a central, common processor, which is supplied with actual values in keeping with the individual section currents and connected to corresponding control inputs of the respective buck converters for applying control values calculated on the basis of the actual values.

Abstract: A ballast that selectively operates multiple lamps is provided. The ballast includes a switching network, capable of operating in a number of switching configurations. The ballast also includes a control circuit, and two lamp control switches. The control circuit is connected to the switching network, and provides respective control signals via respective output terminals as a function of the switching configuration of the switching network. Each lamp control switch is in parallel with its lamp and is connected to a respective output terminal. The first lamp control switch is connected to a ballast power supply, and either provides power to the first lamp or does not, depending on the first control signal. The second lamp control switch is connected to the first lamp control switch and to ground, and either provides power to the second lamp or does not, depending on the second control signal.

Abstract: An apparatus, method, and system are disclosed for providing AC line power to lighting devices such as light emitting diodes (“LEDs”). A representative apparatus comprises: a plurality of LEDs coupled in series to form a first plurality of segments of LEDs coupled in series; a plurality of switches coupled to the plurality of segments of LEDs to switch a selected segment into or out of a series LED current path in response to a control signal; a memory; and a controller which, in response to a first parameter and during a first part of an AC voltage interval, determines and stores in the memory a value of a second parameter and generates a first control signal to switch a corresponding segment of LEDs into the series LED current path, and during a second part of the AC voltage interval, when a current value of the second parameter is substantially equal to the stored value, generates a second control signal to switch a corresponding segment of LEDs out of the first series LED current path.

Abstract: The present invention provides an LED moudle and an LED light string using the same. The LED module has an input terminal, an output terminal, a primary LED, a spare LED and a switching module. The switching module controls the spare LED to be switched off while the primary LED is switched on; and controls the spare LED to be switched on while the primary LED is burned out. Hence, the present invention extends a service life of the LED light string using the LED modules in the backlight module.

Abstract: An LED lighting arrangement comprising at least one LED, for producing light is disclosed. A power supply provides power for the at least one LED. At least one control circuit is coupled to the at least one LED in a way that directly or indirectly uses, to power the at least one control circuit, one or more forward voltage drops across the at least one LED. Beneficially, one or more additional control circuits can be added without redesign of the power supply for the at least one LED.

Abstract: A driving apparatus for a fluorescent tube and a method thereof and an illumination apparatus using the same are provided. The driving apparatus stops providing power, when a fluorescent tube has broken, to both ends of the broken fluorescent tube regardless of whether a power switch related to the fluorescent tube is in ON or OFF state, and thus making sure that a person is under a safety condition without getting an electric shock during replacing the broken fluorescent tube; moreover, the driving apparatus automatically detects the newly installed fluorescent tube and automatically light up the newly installed fluorescent tube after the broken fluorescent tube is replaced and it is unnecessary to switch the power switch related to the fluorescent tube anymore, and thus avoiding a potentially hazard for the person who climbs up and down a ladder repeatedly.

Abstract: The present invention includes one embodiment containing an LED lighting assembly containing: a troffer; a bulbless and/or tubeless sub-housing; one or more solid state lighting units contained within the troffer and actuated by alternating current power; a night light contained within the bulbless sub-housing and operably communicating with the solid state lighting units, the night light actuated in the absence of light from the solid state lighting units; one or more light emitting diodes contained within the night light; and a battery source for powering the night light in the event of power interruption. In yet another embodiment of the invention, a replaceable lighting unit contains: a bulbless and/or tubeless sub-housing. One or more light emitting diodes are contained within the sub-housing. A battery source may be contained within the sub-housing, and the battery source may be configured to selectively power the light emitting diodes with direct current energy.

Abstract: A lamp operation device includes a mode setting part that sets an operation mode for lamps, and a lamp operation part that controls switching between the lamps in accordance with the set operation mode. The lamp operation part includes a process corresponding to a manual switching mode in which a lamp selected by a user is set as an illumination lamp, and a process corresponding to an automatic switching mode in which the plurality of lamps is automatically set in sequence as an illumination lamp. In the automatic switching mode, after one lamp has been set as the illumination lamp, cumulative illuminating time (amount of change) of the lamp is measured. Then, the illumination lamp is switched to the other lamp, depending on whether a measurement result has exceeded predetermined threshold time.

Abstract: An LED lamp includes an optical part, a heat dissipation part and an electric part. The optical part includes main and auxiliary LED light sources thermally attached to the heat dissipation part. The electric part includes a rechargeable battery and a circuitry for converting an external AC power source into first and second DC power sources. The auxiliary LED light source is connected to the first DC power source for providing an auxiliary illumination when the external AC power source is normally supplied or to the rechargeable battery for providing an emergency illumination when the external AC power source is interrupted. The main LED light source is connected to the second DC power source for providing normal illumination when the external AC power source is supplied normally. Photoelectric switches are also provided for controlling the action of the auxiliary LED light source.

Abstract: A lighting system, a lighting unit and a method for controlling a plurality of light sources are described. A lighting system comprises an intelligent electrical current supply 12 to supply an electrical current with modulated command data. A plurality of lighting units 4, 6, 8 are connected in series to the current supply 12. Each lighting unit comprises a light source 22, a controllable bypassing switch 24 to selectively bypass the light source and a control unit 26. The control unit receives the modulated command data and controls the bypassing switch 24 accordingly.

Abstract: A system for mounting an outdoor fluorescent lamp lighting fixture to a pole includes a compression sleeve configured to receive and tighten around the pole, a pivot base fixed to the compression sleeve, a mount configured for securing to the fluorescent lamp lighting fixture and for pivotally coupling to the pivot base, where the mount includes multiple adjustment points configured to allow the mount to be fixed at varying angles relative to the pivot base.

Abstract: Disclosed is a control system for several distributed lamp-operating devices, comprising at least one control station (1), a control line (2) that connects the control station (1) to each lamp-operating device, and a receiver which is allocated to each lamp-operating device and is used for communicating with the control station (1). Each lamp-operating device in said control system is part of a first or a second type while lamp-operating devices of the first and the second type can be combined into functional couples. The lamp-operating devices of the first type (20-1, 20-2) are configured and connected to the respectively allocated lamp-operating device of the second type (10-1 to 10-4) so as to be able to selectively activate or deactivate the lamp-operating devices of the second type (10-1 to 10-4) in accordance with a request by the control station (1).

Abstract: Embodiments of this invention provide a secondary, or back-up, lighting system for light fixtures having a primary light source. The back-up lighting system is configured to mount onto a support structure of the light fixture. The back-up lighting system includes a light source and a lens with optical properties. A housing retains the light source and lens. The back-up lighting system may include a controller that monitors the main power source for the primary light source of the light fixture. The controller activates the light source of the back-up lighting system upon detecting power restoration after a power loss. In some embodiments of this invention, the back-up lighting system includes a secondary power source that powers the back-up lighting system during a loss of power.

Abstract: A method for controlling a dual lamp module applied to a projection apparatus is provided. The dual lamp module includes a first lamp and a second lamp. The method for controlling a dual lamp module includes providing a first operating power to the first lamp, and then determining whether the first lamp is turned on or not. If the first lamp fails to be turned on, stopping providing the first operating power to the first lamp, and providing a second operating power to the second lamp. The second operating power is greater than the first operating power.

Abstract: The invention comprises an auxiliary lamp controller and related circuits to operate an auxiliary lamp and circuit to light auxiliary lamps at 120 VAC and 50-60 Hz current connected to an electronic HID ballast operating at a frequency of 50-60 Hz to over 400 kHz and voltages of 120-277 VAC or connected to a magnetic HID ballast operating at 120-277 VAC and 50-60 Hz, as provided by a multitap transformer and related circuitry wherein the auxiliary lamp is illuminated during HID lamp phases of being extinguished from loss of power or other reasons, and during cool-down, start-up and warm-up phases of the HID lamp, and the auxiliary lamp is extinguished upon the HID lamp reaching full illumination phase.

Abstract: For safety reasons, industrial lighting fixtures are required to have backup lighting systems so that if the primary lights should fail, there will still be enough light to ensure safe maneuvering. Typically these backup lighting systems have their own power or drive source. The present application contemplates a lighting ballast circuit that is able to power a primary high intensity discharge (HID) lamp and is also able to power an auxiliary lamp in the event of temporary or permanent failure of the HID lamp.

Abstract: A backup architecture for a backlight module comprises a first power system and a second power system, each having an enable mode and a disable mode; and a sensor unit, electrically connected to the first and the second power systems. In the enable mode, the first power system or the second power system is enabled to drive the backlight module to emit light. In the disable mode, the first power system or the second power system is disabled and stops driving the backlight module. The first and the second power systems are interconnected in parallel. When one of the first power system and the second power system enters into the enable mode, the other enters into the disable mode. The sensor unit acquires the working signals of the first and the second power systems and monitors whether the first power system or the second power system is in an abnormal state.

Abstract: A lighting device including: a power management module connected with and processing alternating-current power and outputting direct-current power; a light source driving module receiving and processing a portion of the direct-current power and outputting a light source driving signal; a first lighting unit receiving the light source driving signal and illuminating a light source; a sensing unit sensing the light source driving signal intensity; a lighting module receiving a portion of the direct-current power output by the power management module, processing the received direct-current power, outputting a direct-current power signal, storing the direct-current power signal through a power storage control function, processing the stored direct-current power signal by means of a power storage control unit whenever the sensing unit senses that the light source driving module does not output the light source driving signal, and outputting a lighting light source driving signal to a second lighting unit for illum

Abstract: The embodiment disclosed herein relates to a lighting system that includes an auxiliary lighting circuit for use with an electronic HID ballast. The lighting system comprises a power supply configured to provide power to a high intensity discharge (HID) lamp via an electronic ballast and a ballast power sensing component configured to determine the amount of power drawn by the electronic ballast and to convert this power drawn by the electronic ballast to a scaled voltage that is representative of the power drawn by an HID ballast. A lamp driver component is configured to provide power to an auxiliary lamp via the same power supply when the scaled voltage reaches a triggering threshold. A voltage regulation component is configured to regulate the power delivered to the auxiliary lamp such that the auxiliary lamp power stays within a predefined range.

Abstract: A high-intensity discharge lamp ballast includes a lamp operation unit configured to supply power from a power source to a high-intensity discharge lamp, a lamp voltage detector configured to detect a voltage applied to the high-intensity discharge lamp, a lamp status determination unit configured to determine whether the high-intensity discharge lamp is in a turned-on state, based on the voltage detected by the lamp voltage detector, an auxiliary lamp switching element configured to connect the power source and an auxiliary lamp having a rated voltage, and a controller configured to control the auxiliary lamp switching element so as to apply to the auxiliary lamp a voltage substantially equal to the rated voltage of the auxiliary lamp when the high-intensity discharge lamp is supplied with the power and the lamp status determination unit determines that the high-intensity discharge lamp is not in the turned-on state.

Abstract: A High-Intensity Discharge lamp which includes a high intensity discharge light disposed within the light cavity and a standby lighting control system including a light sensor for detecting a light intensity within the light cavity and a standby lamp which is supported within the lamp housing and is activated by the light sensor between a standby mode and a backup mode, wherein at the standby mode, when the light intensity of the high intensity discharge light within the light cavity is above a predetermined threshold, the standby lamp is deactivated, and at the backup mode, when the light intensity of the high intensity discharge light within the light cavity is dropped below the threshold, the standby lamp is activated for generating a backup light to compensate a loss of the light intensity of the high intensity discharge light.

Abstract: In an electric freezing refrigerator, when a light emitting diode of back light unit deteriorate due to an external impact or an internal defect or a port terminal of a microcomputer applying power to the light emitting diode is damaged, the back lighting of electric freezing refrigerator can be stably performed by turning another back light unit of the electric freezing refrigerator on.

Abstract: An emergency lighting function illumination appliance comprised of a fluorescent lamp tube, a controller, a mains power circuit capable of processing mains electric power for lighting, and a backup circuit that provides for a backup power source. With these devices combined, the controller produces the following functions: 1) When mains power is normally supplied, an ON-OFF switch approach controls the fluorescent lamp in accordance with user intent. 2) During a mains power outage, the power circuit is automatically shifted to the backup circuit and the backup power source supplies electricity for emergency lighting. 3) When mains power supply is restored, the power circuit is automatically shifted to the mains power circuit and the mains power resumes the ordinary lighting function.

Abstract: A vehicle light apparatus 1 includes a discharge lamp 7 as a dipped (low)-beam light source and a high-beam light source or a light source of an auxiliary light (incandescent lamp) 3 as a substitutional light source of the discharge lamp. If the apparatus detects an input voltage from a power supply becoming equal to or greater than a threshold value in a state that only the discharge lamp is lit, the incandescent lamp is automatically lit on. To use the high-beam light source in place of the discharge lamp, light extinction lighting is performed or the light application direction is directed downward from the horizontal direction.

Abstract: A plurality of light emitting diodes are mounted on a base that encircles or surrounds a primary vehicle light source such as a headlight, a taillight, a turn signal light or the like. A control circuit senses when the primary light source fails to provide the requisite light, and applies power to the light emitting diodes so that the vehicle can continue safely without loss of the function served by the primary light source. Additional diodes may be provided on the base to serve an ornamental function.

Abstract: A driving circuit for LED lamps includes a DC power unit, a control unit connected to a bank of LEDs, and a backup power unit. The DC power unit outputs DC power to the control unit, the bank of LEDs, and the backup power unit. When DC power from the DC power unit is interrupted, the backup power unit outputs DC power to the bank of LEDs. The driving circuit may be incorporated into various lamp types, including wall lamps, indicator lamps, and emergency lamps.

Abstract: An illumination unit, that comprises a lamp; an adaptor for attaching the electrical contacts of the unit to contacts of a socket being connected to an electricity network feeding the unit through a switch, the switch electrically connects/disconnects at least one contact of the unit to/from the electricity network, while being in its conductive/nonconductive state, respectively; a rechargeable element for supplying electrical power form to the lamp during emergency period, when the electricity network fails, and an electronic circuit for automatically detecting the state of the switch and failure of the electricity network and to operate the lamp, which is operative to disconnect the unit from the rechargeable element from the electricity network, if failure is detected whenever the switch being in its conductive state, or otherwise, to disconnect the unit from the electricity network and from the rechargeable element whenever the switch being in its nonconductive state.

Abstract: A discharge lamp lighting circuit 1 has a DC power supply section 4 for receiving power supply from a DC power supply 2, a DC-AC conversion section 5 for converting an output voltage of the DC power supply section 4 into an AC voltage and then applying the AC voltage to a discharge lamp 8, and a starter circuit 6 for applying a high-voltage pulse to the discharge lamp 8 for starting the lamp. A control circuit 7 detects an anomaly occurring in the discharge lamp or the lighting circuit and stops supplying power to the discharge lamp 8 and also lights another light source as an alternative light source to the discharge lamp 8 or notifies a driver of occurrence of the anomaly. An internal state monitoring circuit 26 is provided for monitoring the operation state of the control circuit itself and when an anomaly about the control circuit 7 is detected, the alternative light source is lighted or the driver is notified of occurrence of the anomaly.

Abstract: The invention relates to a method and ballast for operating a lamp (3) fitted with a fluorescent tube (2), whereby the operating data of certain recognizable lamp types (T1, T2, Tn−1, Tn), at least the lamp voltage (UL), lamp current (IL) and preheating currents (Ivorh1, Ivorh2, Ivorhn−1, Ivorhn) is stored in a register (R) for the heating of the electrodes.

Abstract: In order to make continuous lamp operation in a failsafe lamp, particularly a lamp for medical applications, having a discharge lamp possible even When changing over between a power supply system (low voltage supply system of, for example, 24 V) and an additional safety power supply (ZSV), a buffer store is discharged in the event of a fault in the power supply for a supply unit for the lamp by changing over to a standby power source, or, once the fault has been elitinated, from the standby power source back to the normal power supply, the buffer store outputting electrical energy to operate the discharge lamp. The electrical energy supplied to the supply unit (EVG) first passes through a full-wave rectifier and is then supplied to a voltage converter containig the buffer store. The discharge lamp is subsequently supplied with the electrical energy via a power-regulated inverter. Thus, it is ensured that, even for changeover procedures with different current types—e.g.

Abstract: An apparatus and method are provided for operating one of a plurality of lamps employed within a luminaire via a single ballast, thereby extending the operational life of the luminaire. The operating lamp disables the lamps downstream from itself by preventing current from conducting through lamps other than the operating lamp. The lamps upstream from the operating lamp typically lack a sufficient voltage for ignition and operation. However, if any of the upstream lamps begin to operate, the lamps operating downstream cease to operate. In the event that two lamps begin to operate in an asymmetric manner, a capacitor is preferably provided to maintain a reverse voltage with respect to the output of the ballast, thus ensuring reduced voltage across the rectified lamps until one lamp extinguishes and the second lamp begins to operate.

Abstract: A ceremonial illuminary including a voltage supply mechanism, a switching mechanism that is electrically connected to the voltage supply mechanism, a first lamp electrically connected to the switching mechanism, a second lamp electrically connected to the switching mechanism wherein the switching mechanism provides voltage to the first lamp to illuminate the first lamp and then switches to provide voltage to the second lamp instead of the first lamp when the first lamp burns-out and no longer illuminates. The first lamp and the second lamp are secured with an enclosure.

Abstract: A lighting system provides an auxiliary lighting circuit for turning on an auxiliary light source in place of the discharge lamp if the abnormality in the lighting circuit is detected.

Abstract: A vehicle light system circuit includes a PROFET to automatically detect the presence of a faulty light source and switch to an unaffected light source. The system also adjusts the brightness of the unaffected light source by adjusting a PWM signal applied thereto to approximate the brightness of the unaffected light source.

Abstract: A recognition light includes a reflector having an axis and first and second annular semi-parabolic reflective surfaces which have respective focal points axially spaced apart from one another, and first and second annular lamps respectively disposed at the focal points. A cover surrounds the reflector and lamps and includes a lens for focusing the light along a plane perpendicular to the axis of the reflector, the lens including first and second Fresnel lens portions each including a convex lens and a prism lens, the convex lenses being disposed adjacent one another and transaxially aligned with the first and second lamps, respectively. A light detector detects light emitted from at least one of the lamps, a monitor circuit provides a fail signal when a characteristic of the light output of at least one of the lamps does not satisfy a specified criteria, and a control circuit first activates the first lamp and then the second lamp in response to receipt of the fail signal of the monitor circuit.