Abstract: A light-emitting circuit includes first and second light-emitting element strings respectively configured to emit light having a first and second color temperatures; a rectifying circuit configured to rectify a voltage, input by an alternating current (AC) power source, to generate a driving voltage; a string switching circuit configured to select at least one light-emitting element string to be used for light emission from among the first light-emitting element string and the second light-emitting element string; an off/on sensing circuit configured to change a selection of the string switching circuit to change a color temperature of light, which is emitted by the light-emitting circuit, when the AC power source is turned off and then turned on; and a driving circuit configured to turn on, in turn, light-emitting elements in the selected at least one light-emitting element string, according to a change in the driving voltage over time.

Abstract: Disclosed is a lighting device with a flexible LED light that may be used as a utility light, work light, or inspection light to illuminate task or work areas. The lighting device is moisture resistant and/or chemical resistant. The flexible LED light is resistant to failure caused by bending and twisting.

Abstract: A method for operating a lighting device having multiple light sources may include determining a measure of a supply voltage and switching the light sources into one or more parallel strands, wherein the light sources in each strand are connected in series, in each case according to the measured value of the supply voltage. Automatic determination of a number of light sources in at least one of the strands, the number corresponding to the largest whole number which, when multiplied by a specifiable forward voltage of each of the light sources, is less than the measured value of the supply voltage. During switching of the light sources the exact number of light sources determined in the at least one strand is connected in series.

Abstract: An apparatus for driving LEDs using high voltage includes two LED driving circuits and two switches that can be turned on or off by a universal controller so as to connect the two LED driving circuits in two different configurations. When the input voltage is in a range from rectified 90 volt AC to rectified 140 volt AC, the two switches are controlled in such a way that the two LED driving circuits are connected in parallel. When the input voltage VIN is in a range from rectified 180 volt AC to rectified 265 volt AC, the two switches are controlled to connect the LED segments of the LED unit in one LED driving circuit in series with the other LED driving circuit.

Abstract: A LED lamp has LED groups, a path controller, a power bank, and a bank controller. The LED groups are arranged in series between a rectified input voltage and a ground voltage. The path controller controls path switches, each path switch for coupling a corresponding LED group to the ground voltage. The power bank is coupled between the rectified input voltage and the ground voltage, having a capacitor and a discharge switch. The capacitor is configured to be charged when the rectified input voltage exceeds a capacitor voltage of the capacitor. The discharge switch is connected between the capacitor and the rectified input voltage. The bank controller determines a connection period and controls the discharge switch in response to a signal turning ON one of path switches, in order to make the capacitor capable of being discharged to the rectified input voltage during the connection period.

Abstract: A light emitting device includes a rectifier circuit, a mutual inductance device coupled to the rectifier circuit, an energy-storing capacitor coupled to a common node of a primary winding and a secondary winding of the mutual inductance device, a light emitting unit coupled to the mutual inductance device, a switch unit coupled to the light emitting unit, and a control circuit. The control circuit is coupled to the energy-storing capacitor and controls operation of the switch unit according to a voltage across the energy-storing capacitor.

Abstract: Enhancements to ornamental or holiday lighting are disclosed including remote control ornamental illumination with color pallet control whereby a user can vary the color/intensity/appearance of an individual bulb or entire light string by selecting the electronic address of the bulb and selecting its attribute. Further disclosures include: motion responsive lights which respond to sensed movement, gesture controlled lights, adjustable white color/white led sets, connectable multi-function lights, controller to sequence lights to music or other input source, rotating projection led light/tree top/table top unit, and remote controlled sequencing icicle lights and ornament lighting system.

Abstract: An LED lighting circuit where the configuration of the connection of two or more LEDs are changed from parallel to series through the use of solid state switches depending on whether the voltage level from an AC source measured by a voltage detector exceeds the sum of the forward voltages of the LEDs. Also, a method of activating LEDs in an LED array lighting apparatus involving applying a rectified alternating current to two or more LEDs, each LED having a forward bias voltage; comparing the rectified alternating current to the sum of the forward bias voltages of the two or more LEDs; and changing the circuit configuration of the two or more LEDs between a parallel connection and a series connection with respect to the rectified alternating current depending on whether the rectified alternating current exceeds the sum of the forward bias voltages of the two or more LEDs.

Abstract: A light generating device (1) is provided with at least a voltage input (21) adapted for receiving a variable voltage, at least three LED circuits (10), coupled with said voltage input (21), wherein each LED circuit (10) comprises a LED unit (14) and controllable current regulator (15) to control the current through said LED circuit (10). The light generating device (1) further comprises a controllable switch matrix (30) comprising a plurality of switches (25, 26, 27), said switch matrix (30) is configured to operate in at least three different switching modes and a controller (50), connected at least with said switch matrix (30), configured to determine said variable operating voltage and to control the switching mode of said switch matrix (30) in dependence of the determined operating voltage.

Abstract: A battery operated LED lighting apparatus including: a battery outputting a battery voltage; a light emitting diode or array of light emitting diodes; and a power supply including a boost regulating circuit. The power supply being in communication with the battery and the light emitting diodes such that a constant voltage or constant current is supplied to the light emitting diodes as the battery discharges and the battery voltage falls below the output voltage. In a preferred embodiment the power supply further includes a buck regulator to maintain the proper output voltage when the battery voltage is greater than the output voltage.

Abstract: A lighting module may include at least one light source, and an identification element that identifies the supply current required by the light source, wherein the identification element includes a first terminal and a second terminal for connection to an electronic converter. In particular, the identification element includes at least one shunt regulator configured for limiting the voltage across the first terminal and the second terminal to a maximum threshold voltage, wherein the maximum threshold voltage identifies the supply current required by the light source.

Abstract: A lighting system comprising a constant current power source one or more sets of light emitting elements, and associated circuitry. The light emitting elements may be light emitting diodes (LEDs) that have been selected to emit light having specific wavelengths corresponding to specific colors. The lighting system may selectively control the intensity of each set of LED by utilizing pulse-width modulation. The sets of LEDs may be serially connected and selectively operated independently of each other set of LEDs.

Abstract: A light-emitting device includes multiple light-emitting diode units sequentially connected and coupled to a first power source, a switching circuit connected to the light-emitting diode units, a second power source, and a control module. Power provided by the first power source is larger than power provided by the second power source. The second power source is connected to the light-emitting diode units through the switching circuit, which is controlled by the control module to facilitate the delivery of the power of the first power source or the second power source to the light-emitting diode units. When the first power source serves to deliver the power thereof to the light-emitting diode units, the light-emitting diode units may be in a serial conduction. When the second power source serves to deliver the power thereof to the light-emitting diode units, the light-emitting diode units may be in a parallel conduction.

Abstract: A direction indication lamp control device includes: a current control element including an end which outputs a drive current having a magnitude corresponding to amplitude of a pulse signal; a current clamp unit which limits the drive current to a current upper limit value; a voltage clamp unit which limits a reference voltage to a voltage upper limit value; and a wire disconnection detection unit which outputs a wire disconnection detection signal in a case where the drive current corresponding to the pulse wave of the pulse signal is equal to or less than a wire disconnection detection value, or in a case where the reference voltage is equal to the voltage upper limit value. The current upper limit value is smaller than the drive current flowing through a direction indication lamp when the reference voltage is the voltage upper limit value.

Abstract: A lighting device and a method of controlling a light emitted thereby are disclosed. A lighting device according to the present invention includes a rectifier unit configured to rectify an alternation current voltage to supply the rectified voltage to each of light emitting units, the light emitting units configured of a plurality of light emitting diodes connected with each other in series, a control unit configured to control each light emitting unit and a first switching element based on the input voltage and the first switching element configured to be switched on and off based on the control of the control unit, wherein the control unit controls to the first switching element switch on and off based on the input voltage to connect the first light emitting unit and the second light emitting unit alternatively in series and parallel.

Abstract: An AC LED lighting apparatus using a voltage edge detector is provided. The AC LED lighting apparatus includes: a rectification unit configured to rectify an AC voltage to output a DC rectified voltage; an LED unit including a first light emitting group and a second light emitting group each including at least one LED; and an LED driving control unit configured to control a serial/parallel connection relationship between the first light emitting group and the second light emitting group by comparing a voltage level of the rectified voltage input from the rectification unit with a reference voltage. The LED driving control unit sets the reference voltage by detecting a slope of the rectified voltage and simultaneously detecting the voltage level of the rectified voltage and the detected slope of the rectified voltage.

Abstract: The LED lighting apparatus includes: a rectification block; an LED block including a first light emitting group and a second light emitting group; a charging/discharging block configured to charge electric charges in a charging period, and discharge electric charges in a discharging period; a driving control unit configured to determine a voltage level of a rectified voltage, controls a path selection switch to connect the rectification block to the LED block and controls the charging/discharging block to charge electric charges in the charging period, and controls the path selection switch to connect the rectification block to a ground and controls the charging/discharging block to discharge electric charges from the charging/discharging block to the LED block in the discharging period; and a path selection switch configured to connect the rectification block to the LED block in the charging period, and connect the rectification block to the ground in the discharging period.

Abstract: An apparatus comprises a plurality of controllable LED strings interposed with a plurality of switching units with each switching unit being connected between a leading controllable LED string and a trailing controllable LED string. A controller controls the switching units so that controllable LED strings are connected in a combination of series and parallel connections by connecting two adjacent leading and trailing controllable LED strings in series or parallel or by-passing the leading controllable LED string based on an automatically detected input voltage range. Each controllable LED string includes a plurality of LEDs connected in series between positive and negative ends of the controllable LED string and a plurality of controlling switches each corresponding to an LED. The number of LEDs connected in series in each controllable LED string is further adjusted by the controller as the input voltage varies with time.

Abstract: A plurality of switching units interleaves with a plurality of LED-based lighting units to configure the interconnection of the LED-based lighting units for providing multiple lighting modes. Each switching unit disposed between a leading lighting unit and a trailing lighting unit is separately controlled by a controller. The switching unit can be configured to connect the two LED-based lighting units in parallel or in series, or to bypass the leading LED-based lighting unit. All the LED-based lighting units are connected in series when an input voltage supply is at a maximum voltage level, and connected in parallel when the input voltage supply is at a minimum voltage level. As the input voltage level decreases, the number of LED-based lighting units connected in parallel increases, and vice versa.

Abstract: Lead frames for light emitting device packages, light emitting device packages, and illumination apparatuses employing the light emitting device packages. The lead frame including a plurality of mounting portions on which a plurality of light emitting device chips are mounted; a plurality of connection portions for circuit connecting the plurality of light emitting device chips; a terminal portion extended from the plurality of connection portions. The light emitting device package is formed by directly mounting the plurality of light emitting device chips on the lead frame and packaging the mounted light emitting device chips on the lead frame. The lead frame includes a plurality of connection portions for circuit connecting the plurality of light emitting device chips and a terminal portion in which a part of a circuit thereof is exposed.

Abstract: An illumination apparatus includes a rectifier, a linear regulator, a lighting unit and a temperature sensing control circuit. The rectifier is connected to an AC supply voltage. The regulator is electrically connected to the rectifier and is adaptive to a first voltage. The lighting apparatus and the regulator form a circuit coupled to the AC power supply. The lighting unit has first and second loads having respective first and second lighting components adaptive to the first voltage. The control circuit can effectively sense the temperature of the regulator and thereby determines whether the first and second load are connected in series or in parallel. If the supply voltage is the first voltage, the first and second load is connected in parallel. If the supply voltage is a second voltage greater than the first voltage, the temperature sensing control circuit switches the first and second load to be connected in series.

Abstract: The present invention provides LEDs and zener diodes that are homo-polar and connected in parallel to constitute the first set of LED and zener diode and a second set of LED and zener diode; the first LED and zener diode set and the second LED and zener diode assume a reverse polarity series connection to constitute the voltage-limiting and reverse polarity series type LED device; through the selection of connecting pins, it is used on direct current power source or alternating current power source which is its characteristics.

Abstract: A plurality of switching units interleaves with a plurality of LED-based lighting units to configure the interconnection of the LED-based lighting units for providing multiple lighting modes. Each switching unit disposed between a leading lighting unit and a trailing lighting unit is separately controlled by a controller. The switching unit can be configured to connect the two LED-based lighting units in parallel or in series, or to bypass the leading LED-based lighting unit. All the LED-based lighting units are connected in series when an input voltage supply is at a maximum voltage level, and connected in parallel when the input voltage supply is at a minimum voltage level. As the input voltage level decreases, the number of LED-based lighting units connected in parallel increases, and vice versa.

Abstract: An LED array switching apparatus, comprises: a plurality of LED segments D1 to Dn connected in series, each LED segment having a forward voltage; a voltage supply coupled to the plurality of LED segments; and a plurality of constant current sources G1 to Gn, coupled to outputs of LED segments D1 to Dn, respectively. Each of the constant current sources is switchable between a current regulating state and an open state such that as the voltage of the voltage supply increases, LED segments are switched on and lit to form a higher forward voltage LED string, and as the voltage of the voltage supply decreases, segments are switched off and removed from the LED string starting with the most recently lit segment.

Abstract: An optimum regulation method is disclosed for reconfigurable LED arrays used for general illumination applications. This document describes a reconfigurable LED array formed by connecting in series LED lamps and LED pairs capable of being reconfigured in either series or parallel. The performance deficiencies of previous solutions are solved by changing the voltage rating of the array through the reconfiguration of LED pairs. The simplicity of the concept can make practical the implementation of driverless LED lighting fixtures.

Abstract: A transient voltage suppressor circuit is disclosed for a plurality (N) of LEDs connected in series. Only one zener diode is created for connection to each node between LEDs, and a pair of zener diodes (the “end” zener diodes) are connected to the two pins (anode and cathode pads) of the series string. Therefore, only N+1 zener diodes are used. The end zener diodes (Q1 and Qn+1) effectively create back-to-back zener diodes across the two pins since the zener diodes share a common p+ substrate. The n+ regions of the end zener diodes Q1 and Qn+1 have the highest breakdown voltage requirement and must be placed relatively far apart. Adjacent n+ regions of the intermediate zener diodes have a much lower breakdown voltage requirement so may be located close together. The zener diodes may be placed within a very small footprint or can be larger for better suppressor performance.

Abstract: A lighting device and a method of controlling a light emitted thereby are disclosed. A lighting device according to the present invention includes a rectifier unit configured to rectify an alternation current voltage to supply the rectified voltage to each of light emitting units, the light emitting units configured of a plurality of light emitting diodes connected with each other in series, a control unit configured to control each light emitting unit and a first switching element based on the input voltage and the first switching element configured to be switched on and off based on the control of the control unit, wherein the control unit controls to the first switching element switch on and off based on the input voltage to connect the first light emitting unit and the second light emitting unit alternatively in series and parallel.

Abstract: An illuminating apparatus adapted to receive an input power which is a pulse DC includes a lighting unit, a detecting unit and a controlling unit. The lighting unit includes a plurality of lighting sets and a switching unit. The switching unit may be used to cause the lighting sets interconnected in a serial fashion and/or in a parallel manner. The detecting unit detects a state of the input power. The control unit couples the detecting unit and the lighting unit, and controls the switching unit according to the detecting unit detecting the state of the input power. As such, the turn-on voltages of the lighting unit may adjust at different stages of the input power.

Abstract: There is provided an LED circuit. The LED circuit may include 2N+2 light emitting units connected between a 2K?1-th node and a 2K-th node among 4N+4 (N is a natural number) nodes including a first node supplied with input voltage (K is all natural numbers equal to or smaller than 2N+2); 2N+2 switches connected between a 2K-th node and a ground (K is all natural numbers equal to or smaller than 2N+2); 2N+1 switches connected between a 2L?1-th node and a 2L+1-th node and 2N+1 switches connected between a 2L-th node and a 2L+1-th node (L is all natural numbers equal to or smaller than 2N+1); and N switches connected between the first node and a 4M+1-th node (M is all natural numbers equal to or smaller than N).

Abstract: A surface light source structure having a circuit board, a first light emitting diode (LED) array, and a second LED array is provided. The first and second LED arrays are assembled on the circuit board. Each LED rows of the two LED arrays has a plurality of LED units connected in series. The LED rows of the first LED array are connected in parallel. The LED rows of the second LED array are connected in parallel. The LED rows of the second LED array are intersected between the LED rows of the first LED array. Positive-to-negative directions of the LED units of the first and second LED array are arranged in opposite directions.

Abstract: This disclosure discloses a light-emitting device. The light-emitting device is capable of receiving a periodic voltage signal comprising a first voltage signal and a second voltage signal. The light-emitting device comprises: a first light-emitting unit; a second light-emitting unit; and a first switching unit comprising at least three switches for receiving the periodic voltage signal. The at least three switches are electrically connected with the first and second light-emitting units such that the first and second light-emitting units are connected in parallel with each other in the first voltage signal, and are connected in series with each other in the second voltage signal.

Abstract: Apparatus and methods for the thermal management of one or more light emitting diode (LED) modules disposed within a channel sign are disclosed. The apparatus, in various aspects, detects the ambient temperature generally proximate the LED module and regulates the current flowed onto the LED's within the LED module based upon the ambient temperature. Methods for thermal management of the one or more LED modules disposed within a channel sign are disclosed herein.

Abstract: A solid state lamp, such as one that can replace an incandescent light bulb, has a base portion having an electrical connector for connection to a source of power, such as an Edison-type connector for connection to the mains voltage. An AC/DC converter in the base converts the mains voltage to a suitable light emitting diode (LED) drive voltage. A plurality of receptacles on the base connects to electrodes of plug-in modules. Each plug-in module supports a plurality of low power LEDs connected in series. The strings of LEDs on different modules are connected in parallel when connected to the receptacles. The modules and base are configured to allow a user to operate the lamp with different combinations of modules to generate a desired light output from the lamp. For example, the user can recreate the lumens equivalent of a 20 W, 40 W, or 60 W bulb by using one, two, or three modules.

Abstract: Apparatus and methods for the thermal management of one or more light emitting diode (LED) modules disposed within a channel sign are disclosed. The apparatus, in various aspects, detects the ambient temperature generally proximate the LED module and regulates the current flowed onto the LED's within the LED module based upon the ambient temperature. Methods for thermal management of the one or more LED modules disposed within a channel sign are disclosed herein.

Abstract: An expandable and controllable LED lighting strip is in the form of a transparent long strip having a plurality of LEDs, and includes a flexible printed circuit board with the LEDs spaced thereon by a predetermined distance. The circuit board is coated with a transparent waterproof protective layer and has a male and a female connector provided to two ends thereof, allowing two or more pieces of the LED lighting strips to serially connect end to end. A control chip is packaged on a reverse side of the circuit board for controlling the LEDs on the same circuit board to operate. The LED light strips can be wound into rolls for storage, and can be serially or parallelly connected to one another to form an LED matrix for widely applying to LED signboards, indicating illuminators, lighting curtains and other furniture to provide illumination or create special atmosphere.

Abstract: Two LED arrays are connected in parallel, and the both ends of the parallel connection are connected to an alternating-current power supply AC. In each of the LED arrays, a capacitor and three LED blocks (the total of four components) are connected in series. In each of the LED blocks, two LEDs are connected in opposite directions. Connection points between components included in one of the two LED arrays are individually connected to connection points between components included in the other one of the two LED arrays via varistors. Even in the event that a disconnection failure occurs at any one of the LEDs, a path of a current via one of the varistors is formed for another one of the LEDs which is connected in series to the LED at which the disconnection failure has occurred. This can prevent the other LEDs from being turned off. Even in the event that a short-circuit failure occurs at any one of the varistors, the normal lighting operations of the LEDs can be maintained unless the LEDs have defects.

Abstract: To provide a light emitting unit and a lighting apparatus capable of handling different voltages. A lighting apparatus 1 includes a switching controller 2 and a light emitting unit 3. The light emitting unit 3 includes two light emitting arrays 21a and 21b and three voltage input terminals 22a to 22c. The switching controller 2 switches connection of the voltage input terminals 22a to 22c according to a supplied voltage of a power supply to connect the light emitting arrays 21a and 21b in parallel or series. A specified voltage is thus applied to the light emitting arrays 21a and 21b.

Abstract: An LED light string with guaranteed conduction has a plurality of LEDs connected in series to form a light string. Both ends of the light string are connected with a power supply to form a closed circuit. Each LED on the light string is connected with a bypass element in parallel. The bypass element can be a Zener diode with a forward voltage higher than that of the LED. When any LED on the light string fails, the current still flows through the circuit via the corresponding bypass element. Therefore, the light string is guaranteed to be conductive even when some of the LED's are broken.

Abstract: A matrix structure-based light-emitting diode array includes a plurality of input resistances connected in parallel to one terminal of a current source, and a plurality of output resistances connected in parallel to another terminal of a current source. Light-emitting diodes are then used to connect each of the input resistances to each of the output resistances. Arranged as such, no two light-emitting diodes is connected in parallel and, as such, the failure of any one light-emitting diode does not extinguish any of the other light-emitting diodes.

Abstract: A circuit for protecting fluorescent lamps connected to high frequency electronic ballasts has a detecting bridge connected to the fluorescent lamps, an output of the detecting bridge varying linearly with the highest voltage across the fluorescent lamps, a number of shunt capacitors equal to the number of fluorescent lamps, each shunt capacitor being connected between the detecting bridge and a corresponding fluorescent lamp, a timer connected to the detecting bridge output, a trigger connected to an output of the timer, the trigger being responsive to an over-voltage condition of a fluorescent lamp operating at failure mode, and a controllable switch connected across the fluorescent lamps, the controllable switch being controlled by an output of the trigger. The controllable switch, when closed, couples the shunt capacitors across the terminals of a corresponding fluorescent lamp and shuts down the fluorescent lamp which is operating at failure mode or at the end of its operating life.

Abstract: A daytime running light circuit is integrated with the existing headlight circuit of an automotive vehicle. The daytime running light circuit functions to automatically illuminate the headlights at reduced intensity when the vehicle is running and the headlight switch is turned off. Any time, however, that the headlight switch is turned on, the headlights are illuminated at full intensity. The daytime running light circuit includes a day relay and a night relay. The night relay is responsive to the headlight switch being turned on for preventing operation of the daytime relay which would otherwise illuminate the headlamps at reduced intensity if the vehicle were running and the headlight switch off. When the headlight switch is off, the night relay enables the day relay to be operated whenever the vehicle is running. Indication that the vehicle is running is obtained from the alternator "R" terminal.

Abstract: A three way lamp having two gas discharge light tubes mounted on the same housing having three terminals arranged thereon as provided on a three-way incandescent lamp.

Abstract: A daytime running light circuit is integrated with the existing headlight circuit of an automotive vehicle. The daytime running light circuit functions to automatically illuminate the headlights at reduced intensity when the vehicle is running and the headlight switch is turned off. Any time, however, that the headlight switch is turned on, the headlights are illuminated at full intensity. The daytime running light circuit comprises a day relay and a night relay. The night relay is responsive to the headlight switch being turned on for preventing operation of the daytime relay which would otherwise illuminate the headlamps at reduced intensity if the vehicle were running and the headlight switch off. When the headlight switch is off, the night relay enables the day relay to be operated whenever the vehicle is running. Indication that the vehicle is running is obtained from the alternator "R" terminal.

Abstract: A power supply circuit for automotive headlamps includes an electrical wire establishing communication between one of the headlamps and a power source at a first position of a combination switch, and a control unit selectively establishing communication between the other headlamp and the power source at the first position and between both of the headlamps and the power source in series at a second position of the combination switch.

Abstract: The invention consists of an electrical circuit for a vehicle headlight system whereby the conventional parallel circuit connection of headlights is automatically converted into a series circuit connection under conditions appropriate for daytime running lights, whereby the light output of the headlights is reduced as compared to that in conventional headlight circuit mode, and a method for interconnecting such circuit with conventional headlight systems.

Abstract: An adapter unit for interfacing the existing brake and turn signal light system of a vehicle with the light system of a trailer. The adapter unit includes a first relay having a single coil and a pair of contacts relatively movable to a closed circuit condition in response to energization of the coil and biased to an open circuit condition. A second relay has a single coil and a pair of contacts also relatively movable to a closed circuit condition in response to energization of its coil and biased to an open circuit condition. The coils are interconnected with the vehicle light system. The contacts are interconnected with the trailer light system and are also connected to the vehicle battery through a different circuit than the one including the turn signal flasher of the vehicle.

Abstract: A three way lamp having two gas discharge light tubes mounted on the same housing in a light-transmitting bulb.

Abstract: A generator for the starting and thereafter maintaining energization and operation of a load which has a relatively high impedance during starting and a substantially lower impedance after starting and during operation thereof. The load may be an ionic conduction lamp including a phosphor excitable lamp in the nature of a fluorescent lamp, or electroluminescent lamp, or vapor lamp. The generator includes a mechanism for generating electrical power with a relatively high voltage and impedance so as to match the relatively high impedance of the load before starting and generization of electrical power of a substantially lower voltage and impedance so as to match the lower impedance of the load during the energizing and operation of the load. The mechanism for generating the electrical power may be an inductive member, such as a coil, and a solid state element, such as a transistor, to develop a voltage over the coil. The coil may be coupled to the lamp through some agent developing a capacitance, e.g.

Abstract: The invention consists of an electrical circuit for a vehicle headlight system whereby the conventional parallel circuit connection of headlights is automatically converted into a series circuit connection under conditions appropriate for daytime running lights, whereby the light output of the headlights is reduced as compared to that in conventional headlight circuit mode, and a method for interconnecting such circuit with conventional headlight systems.