Abstract: A light source (7) with a gas-discharge lamp includes a control module (16) with a driver circuit, an ignition module (17) for producing a substantially high voltage, and a gas-filled burner (18) in which an electric arc is ignited and maintained between two electrodes (19, 20). The control module (16), ignition module (17), and burner (18) are attached to a mutual support system (21) and combined in a single unit. Lighting equipment (1) for a motor vehicle includes at least one light source (7).

Abstract: An interior rearview mirror system includes an interior rearview mirror assembly having a mirror support with a pivot element and a mirror mount configured for attachment to an attachment element at a vehicle. The mirror assembly includes a mirror head having a housing and a reflective element, with the mirror head pivotally attaching to the mirror support via a single pivot joint of the mirror assembly. The mirror assembly includes an imaging sensor disposed at the mirror support and having a forward field of view through the windshield of the vehicle. The mirror assembly includes a headlamp controller that, responsive to sensing of at least one of an oncoming headlight of another vehicle and a taillight of another vehicle by the imaging sensor, at least partially controls a headlight of the equipped vehicle. The mirror support may be configured to accommodate at least one of circuitry and an accessory.

Abstract: A method for selectively providing a low beam state and a high beam state of an LED headlamp, may include driving an engine of a vehicle, switching on a multi-function switch to turn on at least a second LED module to emit a high beam after driving the engine to perform the high beam state of the LED headlamp, and converting a low beam state of at least a first LED module into a high beam state to perform the high beam state of the LED headlamp.

Abstract: Provided is an Adaptive Front Lighting System and a control method thereof, which includes a motor driver which controls a beam irradiation direction of a headlamp by operating a motor coupled to the headlamp according to a motor control signal, and generates a motor fault signal when fail occurs in the motor, a power supply unit which controls a magnitude of electric power supplied to the headlamp according to a power control signal, and a controller which selectively outputs the power control signal to the power supply unit according to the motor fault signal of the motor driver.

Abstract: A vehicle testing lamp system comprising an onboard controller unit, an off-board controller unit, and a lamp fixture. The onboard controller unit comprises a solid state relay, the solid state relay being switchable between an idle output power setting and a high output power setting; a timing circuit,; a transfer circuit; a current sensor; a current regulator; and batteries or other auxiliary power supply. The off-board controller unit comprises a power supply electrically connected to a voltage booster circuit. The lamp fixture comprises an ignitor; a shock mount; and a lamp that is electrically connected to the igniter. The off-board controller supplies power to the lamp at its idle level. The onboard transfer circuit permits the off-board power supply to be disconnected while the onboard controller unit maintains the lamp at idle, and the onboard timing circuit limits the time that the lamp remains at high output. Also disclosed is a method for using a vehicle testing lamp system.

Abstract: A method and apparatus is used to rapidly modulate the intensity of a vehicular lamp for the purpose of enhancing the vehicle's conspicuity. A timer is used to generate a periodically varying pulse width modulated signal that is used to drive a transistor connected to one or more lamps. The modulation rate is chosen such that the lamp or lamps appear to flicker when seen with peripheral vision, yet appears not to flicker when seen out of the center of the eye.

Abstract: A vehicle headlamp includes: a light-emitting module; a control circuit section for controlling a lighting of the light-emitting module; and a reflector including a reflecting face configured to reflect and collect light emitted from the light-emitting module. The control circuit section includes an opposing portion that is opposed to the reflecting face. The opposing portion is disposed at a position away from an optical path of light to be collected by the reflector.

Abstract: In a process in which a control signal having a low level is output from an ON/OFF control circuit to series regulators connected to LEDs serving as lighting targets to turn ON the LEDs in accordance with digital communication information, the ON/OFF control circuit calculates a specified current value to be supplied to the LEDs serving as the lighting targets and compares the specified current value with a detected current value which is detected by a current detecting circuit, and outputs a stop signal to a control circuit on the assumption that a current flows without the series regulators with grounding generated on a cathode side of any of LEDs when the detected current value is greater than the specified current value. When the control circuit turns OFF an NMOS transistor in response to the stop signal, an operation of a switching regulator is stopped.

Abstract: A discharge lamp lighting device is realized, which enables scale and cost reductions thereof, and is capable of reducing a flash at a starting time of the discharge lamp, suppressing a feeling of wrongness at a time of raising a luminous flux, and easily suppressing variations among a plurality of the discharge lamps.

Abstract: A device used with a direct current power source for energizing a lamp. The device includes a plurality of input channels selectively connected to the power source for providing current to the lamp. For each input channel, the device includes a corresponding current sensing component connected to the input channel, and a corresponding bypass switch connected in parallel with the current sensing component. Each current sensing component produces a measurable signal as a function of current that is provided by the corresponding input channel. The device includes a controller connected to the current sensing components and the bypass switches. The controller identifies the input channel that is providing current to the lamp as a function of the measurable signals and controls the bypass switches based on the identified input channel.

Abstract: An automotive lighting assembly receiving light from a power source and for producing light. The automotive lighting assembly includes a first lighting circuit which is operatively connected to the power source for emitting light as a function of electric current. A second lighting circuit is operatively connected to the power source independently from the first lighting circuit. The second lighting circuit emits light as a function of the electric current. The automotive lighting assembly also includes a controller which is electrically connected between the power source and the first and second lighting circuits for independently operating the first and second lighting sources to emit a chosen amount of light in a chosen direction.

Abstract: A process, system and procedure of controls of the supply of a vehicle headlamp suitable to supply lighting in high beam function and/or low beam function, comprising the following stages for at least one of the low beam function and high beam functions: determining at least one driving parameter pertinent to the lighting of the vehicle, defining several lighting modes characterized by the value of this at least one parameter, attributing a supply mode of the headlamp to each lighting mode, and storing in memory the supply mode associated with each of the lighting modes.

Abstract: If a beam state of headlight is manually switched over in a manual control mode, threshold values of vehicle speed, steering angle or the like, are learned for determining the switching over to the low-beam state or to the high-beam state based on the results detected by a speed sensor, illumination sensor, steering angle sensor and weather sensor, and are stored in a nonvolatile memory. In an automatic control mode, a CPU determines the switching over to the low-beam state or to the high-beam state based on the traveling condition detected by the illumination sensor by using the threshold values for determining the switching over learned in the manual control mode. The CPU automatically switches over the state of the beam of the headlight based upon the determination result.

Abstract: A high-intensity discharge (HID) lamp comprising an inner bulb (1) with a discharge vessel (11) and an outer bulb (2), especially for application in an automotive headlight unit is disclosed. A lamp design is proposed by which high thermal stresses and increased quartz temperatures during run-up and steady state operation of the lamp are avoided so that the light output and the lifetime of the lamp is improved. This is substantially achieved by a positioning of the inner and the outer bulb (1, 2) such that a longitudinal axis of the inner bulb (1) is displaced in the operating position of the lamp above a longitudinal axis of the outer bulb (2) so that the distance between the discharge vessel (11) and the outer bulb (2) at the top side of the lamp is decreased and the distance between both at the bottom side is correspondingly increased.

Abstract: A circuit apparatus of an LED vehicle lamp is disclosed. The circuit apparatus includes an input unit, an LED unit and a current limiting unit. The LED unit includes at least one light-emitting device. Each light-emitting device includes at least one LED and a protection device. The protection device and each one LED are connected in parallel. The circuit apparatus of an LED vehicle lamp protects the element of the LEDs from being damaged, increases traveling safety and simplifies maintenance.

Abstract: A lighting device of the type used as reading light in a vehicle. The lighting device comprises a single light-emitting diode and internal supply means adapted to generate a current to the single light-emitting diode. The internal supply means are connectable to an external power network. The device has an optical unit to recenter and focus the luminous flux emitted by the single light-emitting diode.

Abstract: A capacitor 42 (C1) of a first bootstrap circuit 4 for maintaining the ON state of a first switching device 61, one of the two switching devices disposed on a higher potential side of first DC voltage V1, is not only charged with second DC voltage V2, but also supplied with a charging current from third DC voltage V3 on a secondary winding n2 side of a transformer 22, and maintains the ON state of the first switching device 61 for a long time with the charge of both of them. This makes it possible to fix the polarity of the voltage to be applied to the discharge lamp 8 to the single side polarity closer to the DC output operation.

Abstract: A heat dissipation system for a headlight and a headlight cooling method thereof, may include the headlight, a fan motor rotating a cooling fan to circulate air around the headlight while the headlight is operating, a driver integrated circuit monitoring an operation of the fan motor while the headlight is operating, wherein the driver integrated circuit generates a breakdown signal if the fan motor stops while the headlight is operating, a warning light device mounted on an instrument cluster of a vehicle, wherein the warning light device notifies a driver of whether the fan motor is broken down or not, and an electronic control unit operating the warning light device by receiving the breakdown signal from the driver integrated circuit.

Abstract: A curvature estimation unit estimates the curvature of the road on which a vehicle is driving. A swivel angle setting unit is configured to perform a first mode in which a swivel angle of a lamp unit is set such that a light distribution pattern follows the travelling direction of the vehicle based on the curvature estimated by the curvature estimation unit, and perform a second mode in which a swivel angle of the lamp unit is set such that a shielded area created in a light distribution pattern follows the position of the vehicle detected by a vehicle position detector. A pattern determination unit determines a light distribution pattern such that the position of the vehicle detected by the vehicle position detector remains in the shielded area. A swivel angle setting unit performs the first mode when it is determined that the road is a curved road based on the curvature estimated by the curvature estimation unit, and performs the second mode when it is determined that the road is a straight road.

Abstract: A vehicle-mounted load controller is characterized by including: a power terminal connected to a power line through a fuse; load connecting portions to which loads having vehicle-mounted light sources are connected; switches which are provided corresponding to the load connecting portions and which control states of power supply from the power line connected to the power terminal to the light sources connected to the load connecting portions; and a control unit which controls the switches in response to inputted control signals. The vehicle-mounted load controller is characterized in that the multiple load connecting portions to which the multiple light sources for different uses are respectively connected are electrically connected to the power terminal, and that each of the switches stops the supply of power from the power line to the light source connected to the corresponding load connecting portion when the magnitude of current flowing through the light source reaches or exceeds a predetermined value.

Abstract: A device is provided for controlling a light function of a headlight of a vehicle and a method is provided for controlling the light functions of headlights of a vehicle that includes, but is not limited to at least two different light functions are set by at least one drive device and the drive device is activated via a light control unit. The light control unit communicates with a supervision authority, parameters stored in the supervision authority predefining the dynamic behavior of the light functions.

Abstract: An automotive headlamp apparatus comprises: a lamp unit configured to be capable of forming an additional light distribution pattern that includes an upper area above the cut-off line of a light distribution pattern for low beam and that is divided into a plurality of individual patterns; and a controller configured to control formation of each of the individual patterns in accordance with presence of a forward vehicle. The controller reduces the illuminance of an individual pattern overlapping an area where a forward vehicle is present and increases the illuminance of at least one of other individual patterns.

Abstract: The light distribution region of headlights (12) is divided into a plurality of regions, and each of the divided regions can be irradiated or non-irradiated by light, and the light distribution characteristic can be changed separately for each divided region. The radiation or non-radiation of light to each divided region is controlled by a light distribution control ECU (14). Besides, light reflection/emission regions (hatched portions in FIG. 4) are detected by detecting light regions of reflection, such as white lines, reflectors, etc., and light regions of light emission, such as street lights or the like, are detected. Then, divided regions corresponding to light distribution region irradiated by the headlights (12) which correspond to the detected light reflection/emission regions are specifically determined, and the headlights (12) are controlled so that the light radiated to the specifically determined divided regions 22 becomes dark in light distribution relative to other regions.

Abstract: The invention relates to a device for controlling diode lamps comprising a lighting module having at least one diode lamp, the diode lamp pertaining to a predefined range, at least one device for transmitting a unique signature representing the range, and an associated control module comprising reception means (for receiving a unique signature transmitted by the lighting module, and current adjustment means for adjusting and supplying, as a function of the transmitted signature, a current to said lighting module to cause the diode lamp to operate.

Abstract: A tail light for an automobile includes a plurality of first illuminating elements and a plurality of second illuminating elements. The first illuminating elements are arranged to form a logo pattern of the automobile, and each of the first and second illuminating elements are configured for providing an adjustable illuminating brightness. The tail light is capable of selectively operating between a braking state and a non-braking state. In the braking state, the illuminating brightness of the first illuminating elements is greater than that of the second illuminating elements. In the non-braking state, the illuminating brightness of the first illuminating elements is less than that of the second illuminating elements.

Abstract: A driving support system for use in a vehicle uses a headlight controller for directing a headlight beam on a road surface in an intersection when the vehicle stops at the intersection. Another vehicle simultaneously approaching the intersection detects the beam of the surface with an image sensor and processor of the driving support system. The system of the another vehicle sends back a vehicle ID signal to the stopping vehicle when a predetermined beam pattern is recognized by the processor. Then, the system uses a buzzer for notifying a driver of the stopping vehicle that the ID signal has been returned.

Abstract: A system and method of automatically controlling exterior vehicle lights includes an image sensor and a controller to generate control signals. The control signals are derived based on information obtained from the image sensor as well as other detected parameters pertaining to the detected light source(s), the vehicle having the inventive control system, and the ambient environment. The control circuit may simply turn certain exterior lights on or off, or change the brightness, aim, focus, etc. to produce various beam patterns that maximize the illuminated area in front of the vehicle without causing excessive glare in the eyes of other drivers.

Abstract: A relay assembly for a fog light is disclosed which comprises a relay housing having a first terminal adapted to being connected to a switch for operating another light and operation of the switch for illuminating a fog light.

Abstract: A d-c to d-c converter circuit (DDCC) (10) that is comprised of a passive thin-film hybrid circuit that includes an input circuit (12), a voltage regulator circuit (14), a comparator circuit (16), an oscillator circuit (18) and an output circuit (20). The input circuit (12) is applied an input d-c voltage (11) from the vehicle's battery circuit (50). The input voltage (11) is converted by the DDCC (10) into an output d-c voltage (23) that is suitable to operate a set of LED tail lamps and/or a set of LED turn-signal lamps. The DDCC (10) is designed to replace a prior art heat-producing, voltage dropping resistive element (Rx) that drops the battery voltage to a suitable level to operate the LEDs. Additionally, the DDCC (10) is easily spliced into the vehicle's electrical wiring cable (54), requires a small mounting space and produces no significant heat.

Abstract: The invention relates to a lighting device for a motor vehicle. Said lighting device comprises a gas discharge lamp (1; 96) for emitting light, a starting device for providing a starting voltage for starting the gas discharge lamp (1; 96) and a control device for providing an input voltage for the starting device and an operating voltage for operation of the gas discharge lamp (1; 96). The control device is an integral part of the starting device. In order to come to grips with the problems associated with space and temperature with such lighting devices, the invention proposes that the combined starting and control device (5; 80) has a plug element (6) for connecting a vehicle power supply system voltage (7), the plug element (6) being in the form of a printed circuit board plug, which is formed by conductor tracks (21; 23) guided at an edge of a printed circuit board (20) of the starting and control device (5; 80).

Abstract: The invention relates to a vehicle headlamp containing a multiple number of LED light sources and at least one optical unit upstream of the LED sources, whereby the LED light sources are arranged in groups with one group of LED light sources to generate a specified light distribution, whereby the LED light sources within one group of LED light sources are of equal size, whereby the dimensions of the LED light sources within one group of LED light sources and/or the optical unit demonstrate the illumination characteristics needed to ensure that the group of LED light sources completely fulfills at least one specified lighting function in the vehicle environment, whereby light spots are produced with a vertical and/or horizontal critical angle within the range of between 0.2° and 1°.

Abstract: A vehicular headlamp, wherein a light source unit for light distribution formation is accommodated inside a lamp chamber defined by a lamp body and a front cover, includes a metal heat transfer member that serves as a light source unit structural member; a light-emitting element that serves as a light source; a fan for cooling the light-emitting element provided inside the lamp chamber; and a lighting circuit that controls lighting of the light-emitting element. The light-emitting element, the fan, and the lighting circuit are each attached to the metal heat transfer member.

Abstract: A control circuit for turning on/off automobile lights is connected to first, second and third power output units and an input trigger circuit. When a car is started, the second power output unit supplies power to the control circuit. Thereafter, the third power output unit supplies power to the control circuit for each time when the input trigger circuit is conducted electrically. The control circuit is selectively disconnected from the first power output unit to allow the first power output unit to supply power to turn on the automobile lights. Since the control circuit cannot receive the power from the second power output unit immediately when the engine is turned off, the control circuit will prohibit the first power output unit to supply power to the automobile lights and turn off the automobile lights.

Abstract: Embodiments include lighting systems and methods for controlling the activation of daytime running lamps (DRLs). Embodiments of the method include receiving inputs from one or more on-board subsystems, and when the lighting system is set in an automatic control mode and the headlights are deactivated, selectively activating and deactivating the DRLs based on the inputs. Embodiments of the lighting system include DRLs, headlights, and a processing and control subsystem. The processing and control subsystem is adapted to determine whether a DRL activation criteria is met when the lighting system is set in an automatic control mode, to activate the DRLs when the DRL activation criteria is met and the headlights are deactivated, and to deactivate the DRLs when the DRL activation criteria is not met and the headlights are deactivated.

Abstract: Techniques for providing a method and system for light sensing vehicle light modulator are disclosed. In one particular exemplary embodiment, the techniques may be realized as a method, comprising detecting incoming light utilizing a plurality of light sensors operatively connected to an vehicle, measuring the incoming light intensity, and decreasing a intensity of light output by one or more lights of the vehicle based at least in pan on a measurement of the incoming light intensity.

Abstract: A vehicular lamp includes a semiconductor light source and a switching means arranged to switch between a first lighting mode, in which the semiconductor light source stays on, and a second lighting mode, in which the semiconductor light source repeatedly turns on and off. The lamp is arranged so that a peak current flowing through the semiconductor light source in the second lighting mode is smaller than that in the first lighting mode. The arrangement can help suppress overshooting and undershooting in the light source current.

Abstract: A system for automatically controlling power supply to a lamp (101) of a vehicle, the system comprising: a detection module (20) to detect whether the vehicle is stationary or non-stationary; a controller (102) to receive a signal (25) having a first value transmitted by the detection module (20) when the vehicle is detected as stationary, and the controller (102) to receive a signal (25) having a second value transmitted by the detection module (20) when the vehicle is detected as non-stationary, wherein if the signal (20) having the first value is received by the controller (102), the controller (102) reduces the power supply to the lamp (101) from a first power level to a lower second power level in order to reduce energy consumption of the lamp (101), and if the signal (25) having the second value is received by the controller (102), the controller (102) restores the power supply to the lamp (101) from the lower second power level to the first power level.

Abstract: The present invention relates to an automatic illuminating apparatus for motor vehicles. The apparatus includes an illumination device for emitting light beams, comprising a first light emitting member for emitting light beams in daytime and a controlling device electrically connected with the illumination device. The controlling device includes a sensor for sensing whether the vehicle is in motion, a time recording module for recording current time, a memory for storing an illumination period of the first light emitting member, a processor for analyzing whether the current time is in the illumination period which is electrically connected with the time recording module, the memory and the processor, and a controlling module for controlling the first light emitting member emitting light beams based on an analyzed result from the processor.

Abstract: Disclosed are a lamp igniter module and method of assembling a lamp igniter module. The lamp igniter module comprises a transformer carrier, a slide-in electrical connector, a pc board, and a housing. Assembly of the lamp igniter module is accomplished by initially inserting a transformer carrier assembly within the housing and subsequently installing a slide-in electrical connector which may or may not be attached to the pc board.

Abstract: A vehicle headlamp is provided with: a fixed reflector having reflecting surfaces made of parabola-based free curved faces; movable reflectors having reflecting surfaces made of parabola-based free curved faces; and semiconductor-type light sources having light emitting chips shaped like a planar rectangle. When the movable reflectors are positioned in a first location, a light distribution pattern for low beam is obtained. When the movable reflectors are positioned in a second location, light distribution patterns for high beams are obtained. When the movable reflectors are positioned in a third location, light distribution patterns for daytime running light are obtained. As a result, the vehicle headlamp can achieve downsizing, weight reduction, power saving, and cost reduction.

Abstract: In a discharge lamp apparatus for lighting a discharge lamp, a ballast is disposed outside of a lamp housing of a discharge lamp and is electrically connected to the discharge lamp through a connector. A ballast housing of the ballast is connected to a bottom wall of the lamp housing. In the ballast housing, a ballast circuit board is arranged along a top wall of the ballast housing that is opposed to the lamp housing. Accordingly, it is less likely that the ballast circuit board will be wetted by condensation or water vapor entered the ballast housing. Additionally, a partition wall can be provided in the ballast housing between the connector and the ballast circuit board to block the condensation or water vapor from flowing toward the ballast circuit board.

Abstract: An auxiliary lighting energy interruption system for use with snow plows and like front-mounted vehicle accessories is disclosed which facilitates the interconnection of such systems to the lighting system of a vehicle upon which the vehicle accessory is mounted to provide power to and to control the auxiliary lights with the lighting system of the vehicle. The system provides first and second harness portions for respective installation on the vehicle and the vehicle accessory, with the first harness portion having a first configuration when it is not connected to the second harness portion and a second configuration when it is connected to the second harness portion.

Abstract: A method for controlling a lamp circuit that includes: setting a first voltage threshold and a first time window within a control circuit corresponding to a characteristic of a first lamp type; providing a first signal through the lamp circuit to start a first time interval and create a first test voltage; comparing the first test voltage to the first voltage threshold; and operating a switch to couple an output of the lamp circuit to a source of electrical power if the first test voltage is greater than or equal to the first voltage threshold before the first time interval exceeds the first time window.

Abstract: A method of manually overriding automatic activation of an automatic headlight control system for a motor vehicle, headlamps operable in a high beam state and a low beam state, a high/low beam switch movable from a neutral position to a latched position and from a neutral position to a non-latched position for controlling the state of the headlamps and a headlamp on/off switch comprising a multi-position switch with at least a selectively automatic headlamp position is disclosed. The system includes forward-facing sensor for collecting light emanating from for instance a second vehicle, and a controller for controlling, when the headlamp switch is detected as being in the automatic headlamp position, the headlamp states as a function of the sensed intensity of the beam of light emanating from said second vehicle.

Abstract: A head lamp device for a vehicle includes a DC power source, a diode array having a plurality of series-connected light emitting diodes and a current control circuit that supplies driving current to the diode array. The current control circuit is constituted of a current supply circuit, a voltage measuring circuit, a comparing circuit that compares the voltage drop with a reference value, a judging circuit for judging that there is a short-circuiting at any of the light emitting diodes based on the comparison by the comparing circuit, and a display unit for displaying an alarm when the judging circuit judges that there is a short-circuiting.

Abstract: An automobile circuit includes a power source, a temperature sensor outputting temperature measurement data, a voltage sensor outputting system voltage measurement data, a voltage adjusting module configured to receive the temperature measurement data and the voltage measurement data, and responsive thereto, to output a pulse width modulation signal, a switch that is electrically coupled to the power source and to the voltage adjusting module, the switch being operable to receive the pulse width modulating signal and thereby regulate a duty cycle for voltage from the power source, and a lighting component coupled to receive the voltage from the switch.

Abstract: A discharge lamp ballast apparatus has a reflecting mirror 2 and a power source circuit 5. The reflecting mirror 2 is disposed around a discharge light bulb 1 in such a manner as to cast light from the discharge light bulb 1 in one direction. The power source circuit 5 applies a start pulse of a negative potential with respect to the potential of the reflecting mirror 2 to an electrode 6 located at a side with the higher electric field concentration produced between electrodes 6 and 7 to which a high voltage of the start pulse is applied. This makes it possible to produce a dielectric breakdown near the electrode 6, and makes it easier to start the discharge light bulb 1.

Abstract: Provided is an apparatus and method for providing a fail-safe in a head lamp apparatus.

Abstract: A headlamp controller includes: a headlamp unit configured to illuminate a front area of a vehicle with a light distribution pattern; an image capturing camera configured to capture an image of the front area; and a light distribution controller including: a road shape detecting unit configured to detect a road shape based on the captured image; a reference optical flow generating unit configured to generate a reference optical flow for a target object belonging to one of attributes based on the road shape; a bright point optical flow measuring unit configured to measure an optical flow of a bright point defined as a target in the captured image; and an attribute determining unit configured to compare the reference optical flow with the optical flow of the bright point and determine which one of the attributes the optical flow of the bright point belongs.

Abstract: A headlamp control device for a vehicle is provided. The device includes a front sensor, a wheel speed sensor, an Electrical Control Unit (ECU), a first ballaster, a second ballaster, a relay switch, and a power supply switch. The front sensor senses a target vehicle. The wheel speed sensor detects a speed of a reference vehicle. The ECU outputs a switching control signal. The first ballaster generates a first boosting voltage. The second ballaster generates a second boosting voltage. The relay switch supplies an internal voltage to first and second high-beam lamps, or first and second ballasters. The power supply switch turns on in response to a switching control signal.