Abstract: A method and device for automatically switching on and/or off the illumination of a vehicle. Faulty switching is reduced by adapting the threshold value for switching on the illumination by averaging the measured brightness value(s) according to the driving speed and using switching-off conditions which, inter alia, consider the surrounding brightness.

Abstract: A vehicle headlamp is constituted to have a plurality of lamp units having light-emitting diodes as light sources. At that time, three types of lamp units of different radiation modes; that is, a projector-type lamp unit, direct-projection-type lamp units, and a reflection-type lamp unit, are used as the plurality of lamp units. As a result, a low-beam light distribution pattern obtained as a merged light distribution pattern formed from the light rays output from these three types of lamp units can be readily formed in a desired pattern geometry and a desired distribution of luminous intensity.

Abstract: A headlamp having a plurality of lighting units using light emitting diodes as light sources. A cutoff line forming unit, hot zone forming units, and a diffusion region forming unit are used as these lighting units. Consequently, a light distribution pattern for a low beam having a desirable pattern shape and light intensity distribution can be obtained as the synthetic light distribution pattern of light distribution patterns formed by the irradiation of a light from these three kinds of lighting units.

Abstract: A switching regulator circuit for controlling power supplied to a load, includes: a switching device for repeatedly going on or off to control a voltage or a current applied to the load; a detector for detecting a supply voltage or a supply current supplied to the load; and a controller for controlling a duration ratio of a period in which the switching device is on or off based on the supply voltage or supply current detected by the detector, so as to control a value of the voltage applied to the load.

Abstract: An HID single light emitting point lamp tube switching device is provided for switching the lamp tube between a far light position and a near light position. Initially, a strong current coil and a weak current coil are induced at the same time, so that the HID single light emitting point are moved to the second position, and at end of a time period set in the timer, the strong current coil will be interrupted so that only the weak current coil is actuated to maintain the HID single light emitting point in the second position.

Abstract: A vehicular lamp used in a vehicle, includes: a light source for emitting light in accordance with a voltage given thereto; a light-source controlling transistor for controlling power supplied to the light source by repeatedly switching whether or not the power is supplied to the light source; a capacitor having one end grounded and another end at which a potential is changed like a saw-tooth by charging and discharging of the capacitor; a capacitor controlling transistor for controlling a timing at which the charging and discharging of the capacitor is switched; and a comparator for comparing the potential at the other end of the capacitor to a reference voltage given thereto and controlling a timing at which the light-source controlling transistor is turned on or off and a timing at which the capacitor controlling transistor is turned on or off in synchronization with each other based on the comparison result.

Abstract: An optical axis adjusting system for a vehicle head lamp detects the inclination of the front part of a vehicle with respect to a road surface and controls an optical axis adjusting system by an ECU according to the detected inclination to adjust the optical axis of the head lamp. Therefore, the optical axis adjusting system is capable of finding the accurate inclination of the entire vehicle and properly adjusting the optical axis.

Abstract: A system for controlling at least one exterior vehicle light of a controlled vehicle includes an array of sensors and a control unit. The array of sensors are capable of detecting light levels in front of the controlled vehicle. The control unit is in communication with the array of sensors and the at least one exterior vehicle light and determines a distance and an angle from the at least one exterior vehicle light of the controlled vehicle to a leading vehicle. The control unit is operable to control operation of the at least one exterior vehicle light as a function of the distance and angle, based on the output from the array of sensors, and prevent the at least one exterior vehicle light from providing a disruptive glare to a driver of the leading vehicle.

Abstract: A high pressure discharge lamp starter device comprises a starter circuit OC and control element CC. The starter circuit OC is capable of starting up an essentially mercury free high-pressure discharge lamp HPL containing a rare gas and a metal halide. The control element CC controls the starter circuit OC to start up the high pressure discharge lamp HPL, supply a lamp power larger than twice a rated lamp power, reduce lamp power such that light output is not significantly larger compared to that during a stable light emission time and the light output does not rapidly increase, when a metal halide charged in the high pressure discharge lamp HPL is abruptly vaporized, thereafter, gradually reduce the lamp power so as to settle the rated lamp power.

Abstract: Driving assistance device for a motor vehicle, including at least one emitter of radiation toward the front of the vehicle, a receiver of part of this radiation reflected by a target vehicle, and control and calculation means for influencing the acceleration and braking of the following vehicle in accordance with information coming from the unit comprising the emitter and the receiver and in accordance with data pertaining to the following vehicle. At least the emitter is mounted so as to be rotatable in terms of the azimuth and means for driving the emitter in rotation are provided in order to modify the azimuth of the beam of the emitter in accordance with the curvature of the road. This beam advantageously turns by the same angle as that of the beam of an adaptive lighting system.

Abstract: A vehicular imaging system suitable for use in a vehicle includes at least one imaging array sensor and a control. The imaging array sensor has a field of view directed outwardly from the vehicle and is operable to sense at least one object or light source of interest external to the vehicle. The control is responsive to an output of the imaging array sensor to determine a distance between the imaging array sensor and the object or light source of interest external to the vehicle sensed by the imaging array sensor. The control is operable to control at least one accessory of the vehicle in response to a closest one of the objects or light sources of interest external to the vehicle sensed by the imaging array sensor. The control may be operable to control a headlamp of the vehicle in response to the determined distance.

Abstract: New electrical circuits for controlling two-color side marker light systems on automotive vehicles are disclosed. There is a different control circuit for vehicles with OEM installed separate amber turn signal lights, OEM installed combination red directional, red brake lights, and OEM installed separate red turn signal lights. These circuits are designed to operate two-color side marker light systems in compliance with NHTSA Federal Motor Vehicle Standard No. 108. The side marker lights normally illuminate amber and turn red with the OEM brake lights. In the turn signal mode, the signaled side alternates between the OEM directional light color and off, while the non-signaled side is amber and will illuminate red with the brake light. A fourth new circuit for emergency vehicles will illuminate the marker lights red with the brake lights, or when switch activated will flash each side independently between two colors.

Abstract: A device for triggering a lighting device of a motor vehicle includes a control arrangement which generates at least one pulse width modulated control signal for at least one switching arrangement via which at least one lighting device may be supplied with electric power. The control arrangement receives a measure of the power supply voltage supplied at least to the lighting device in order to influence the control signal as a function of the power supply voltage. The control arrangement determines the control signal as a function of at least one additional operating parameter, in addition to the power supply voltage, of the motor vehicle.

Abstract: A vehicular lamp used in an automobile includes: semiconductor light emitting elements for emitting light; a time measurement unit for measuring time in which the semiconductor light emitting elements continues to emit light; and a current supplying unit for supplying a supply current that increases as the time measured by the time measurement unit increases, to the semiconductor light emitting elements.

Abstract: A vehicular lamp, including: a plurality of semiconductor light emitting devices connected in parallel; a plurality of current limiting units provided corresponding to the plurality of semiconductor light emitting devices, wherein the plurality of current limiting units connect with the corresponding semiconductor light emitting devices respectively in series, and limit electric current flowing through the corresponding semiconductor light emitting devices respectively; and a current control unit for changing electric current to be supplied to at least one of the plurality of semiconductor light emitting devices.

Abstract: A voltage booster of a headlight is connected between a power supply and a headlight and comprises a high frequency circuit, a voltage boost circuit, a rectified circuit, and a high frequency control circuit. The voltage booster comprises an over current sensing circuit connected in front of the headlight and a relay connected between the headlight and the power supply end. When the voltage booster is over circuit, power will supply to the headlight directly. By the voltage booster, the illumination of the headlight is increased and voltage can be stabilized.

Abstract: Lamp units for radiating a beam ahead of a vehicle in a light distribution pattern are housed in a lamp body. Illumination of the auxiliary lamp units is controlled based on driving conditions. Illumination control means extinguish light through dimming by gradually decreasing voltage applied to the light sources. When the applied voltage has dropped to a threshold value, the applied voltage is controlled to zero immediately. Compared to when the lamps remaining in an illuminated state are suddenly extinguished, a change in, quantity of light is mild, and no uncertainty arises. Below a threshold value where the applied voltage gradually drops to the threshold value and a change may arise in the filament crystalline structure due to annealing at a transition temperature, the applied voltage approaches zero. Hence, the filament does not pass from the transition temperature while being rapidly cooled, thus avoiding filament crystalline structure change.

Abstract: The invention relates to a system for in-situ control of the orientation of a vehicle headlamp equipped with a light source fixed on a mobile reflector, and including a camera mounted in the vehicle, an image processing unit connected to the camera, and a specific light point emission device.

Abstract: A vehicular lamp used for a vehicle, includes a semiconductor light emitting element for generating light to be emitted by the vehicular lamp and a current controlling unit for changing a current supplied to the semiconductor light emitting element based on the speed of the vehicle. The current controlling unit may reduce the current, if the speed of the vehicle is lower than a predetermined speed. The current controlling unit may reduce the current, if the vehicle is stopped.

Abstract: A vehicle lighting device uses a high-beam discharge lamp and a low-beam discharge lamp, and includes a DC/DC converter circuit, DC/AC converter circuit, starter circuits, and a control circuit for controlling the lighting of the discharge lamps by detecting voltage or current of each said arch discharge. When the high-beam discharge lamp is lit on in a state that the low-beam discharge lamp is lit off, the low-beam discharge lamp is lit on with some time delay to thereby reduce the number of lighting times and the lighting time. When one of the discharge lamps is lighting, the other of the discharge lamps is lit off, thereby reducing the number of lighting times and the lighting time of the other discharge lamp.

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: In a discharge lamp lighting device having a power source, a HID bulb (5), and an igniter (4), the power source supplies DC or AC voltage to the HID bulb (5), the igniter (4) applies a high voltage pulse to the HID bulb (5) in order to start a discharge therein. The power source has a starting power source (2) to supply a voltage to the HID bulb (5) at the starting of lighting and a steady lighting power source (1) for supplying a current to the HID bulb (5) during a steady lighting after the starting of lighting. A FET (7) as a switching semiconductor device switches the starting power source (2) and the steady lighting power source (1).

Abstract: A lamp's optical axis control system for a vehicle includes vehicle speed sensor, steering angle sensor, a circuit for calculating driver's viewpoint and a controller for controlling the optical axis according to the position of the driver's view point. The controller indicates the position of the driver's viewpoint a certain time in advance according to the vehicle speed signal and the steering angle signal. Therefore, the illumination range of the headlamps can timely provides a desirable driver's view point.

Abstract: The headlight device includes: a pair of left and right headlights, the one on the right road-shoulder side being a double filament type headlight which is switchable between low and highbeams, the other one on the left, oncoming vehicle's side, being a single filament type headlight dedicated for low beam only; and a lighting control circuit which activates the low beam filaments of both headlights in the low beam mode and which activates the high beam filament of the double filament type headlight and the low beam filament of the other headlight in high beam mode.

Abstract: A vehicle travels along a road with its lights on because of the conditions outside the vehicle. It has an onboard optical sensor associated with the headlights and arranged to form an image of a zone of the road in front of the vehicle, so that the state of humidity of the road can be determined, and the light output modified accordingly. The zone concerned, on the road, consists of at least one segment oriented in the direction of travel, so that the image created by the optical sensor is a characteristic curve representing the light distribution on the road. This image is compared with a reference curve to determine the state of humidity. The reference curve represents light distribution when the road is dry.

Abstract: A head lamp's optical axis control system for a vehicle includes a vehicle speed sensor, steering angle sensor, a navigator, an actuator for swiveling the optical axis, a first control circuit for controlling the actuator to swivel the optical axis according to the vehicle speed signal and the steering angle thereby providing a first illumination range and a second control circuit for controlling the actuator to swivel the optical axis according to the vehicle speed and the front road-shape presented by the navigator thereby providing a second illumination range. If it is judged that the front road-shape is not covered by the first illumination range beforehand, the second control circuit controls the actuator to cover the road-shape by the second illumination range.

Abstract: A system for enabling successful use of HID lamps in aircraft, including in particular high power lamps for use as landing lights and taxi lights, utilizes a sealed beam HID lamp which during normal operation has an external temperature considerably lower than the external temperature of a quartz halogen or incandescent sealed beam lamp of equivalent light output. The lower external temperature arises in part from the use of a gas fill in the sealed beam. A detector is provided to monitor the seal integrity of the sealed beam HID lamp and further to provide a response to seal failure resulting in disablement of the lamp. Exemplary ways for accomplishing seal failure detection include radioactive detection, pressure monitoring, and chemical sensing, or other ways wherein detection of a failed seal is followed by an electrical output used to terminate or preclude lamp operation.

Abstract: A control system for daytime running lights (DRLs) is provided that includes a controller for controlling DRLs according to whether the ignition switch is ON and information from the dimmer switch signal of a combination switch, and a plurality of switches that undergo switching according to signals of the controller. Accordingly, if the combination switch is set to activate the DRL system when the ignition switch is ON, a closed loop is formed with both headlights, and the current available to each headlight from the battery is reduced to one half of what it would be if loops were made independently for each of the headlights. When the dimmer switch is selected to high beam, a separate loop is made for each headlight so that a normal amount of current is available to the headlights.

Abstract: An electric discharge lamp device prevents a temperature rise in the circuit device when an electric discharge lamp (30) is operated without the use of a high voltage wire and a high voltage connector. The electric discharge lamp device includes a reflecting member (20) and a circuit device (40) that is directly connected with the electric discharge lamp (30) without using a high voltage wire. The distance between the reflecting member (20) and the circuit device (40) is set at a value not less than 6 mm. In operation, a beam of light emitted from the electric discharge lamp (30) is reflected forward by a concave reflecting face of the reflecting member (20).

Abstract: An oncoming headlight glare reduction system using a controlled shuttering of a shield and the strobing of the headlight.

Abstract: A lighting circuit for lighting a vehicular lamp including a light-emitting diode, includes: a switching regulator for applying an output voltage based on a power-supply voltage received from a DC power supply provided in the outside thereof to the light-emitting diode so as to supply a supply current to the light-emitting diode; an abnormal state detector for detecting an abnormal state of the lighting circuit based on at least one of the output voltage of the switching regulator, the supply current and the power-supply voltage; and an output controlling unit for controlling the output voltage of the switching regulator based on the supply current or the output voltage of the switching regulator and lowering the output voltage of the switching regulator in a case where the abnormal state detector detected the abnormal state.

Abstract: A sensor device, by which the light intensity in the surroundings of the vehicle is detected and which is connected to an evaluation device, by which the signals (S) of the sensor device for the light intensity are compared with at least one threshold value, and from that it is ascertained whether a change in the switching state of the lighting devices is necessary. The evaluation device evaluates signals (S) of the sensor device for the presence of at least one periodically variable signal component (Sk), and in the presence of such a signal component (Sk), the lighting devices are either turned on at a certain level, or remain turned on at that level.

Abstract: A lighting circuit for lighting a vehicular lamp including a plurality of light-emitting diodes, includes: a selection unit for selecting the number of light-emitting diodes to be connected in series in the vehicular lamp based on an instruction from the outside; a switching regulator for applying an output voltage based on a power-supply voltage output by an external DC power supply to the selected number of light-emitting diodes to be connected in series, so as to supply a supply current to the selected number of light-emitting diodes; and an output controlling unit for controlling the output voltage of the switching regulator based on the supply current.

Abstract: A vehicle headlamp including a headlamp unit and an auxiliary lamp in which the brightness of an end portion of the low beam light distribution pattern formed by the beam irradiation from the headlamp unit is reinforced by the auxiliary light distribution pattern formed by the beam irradiation from the auxiliary lamp unit. The high luminous intensity area of the auxiliary light distribution pattern partly overlaps the high luminous intensity area of the low beam light distribution pattern, thus allowing the low beam light distribution pattern and the auxiliary light distribution pattern to be combined. Further, by way of controlling the beam irradiation intensity of the auxiliary lamp unit by a light control unit, the brightness of the low beam light distribution pattern is reinforced by the auxiliary light distribution pattern that has brightness in response to the vehicle running condition.

Abstract: A high-pressure gas discharge lamp with a cooling arrangement is described, which is characterized in particular in that the lamp can be operated at an increased power, an increase in the temperature of the coldest spot in the lamp interior generating a higher gas pressure, while the cooling arrangement (7, 71, 83, 82) is constructed and dimensioned such that a devitrification of the lamp bulb and a condensation of the filling gas are substantially prevented at said increased power. A lighting unit with such a high-pressure gas discharge lamp is further described, as is a power supply unit for operating the lamp. This not only considerably improves the spectral properties of the light, but the lamp also operates at a higher operating voltage because of the higher gas pressure, so that a correspondingly higher lamp power is achieved for a given lamp current. On the other hand, given the same lamp power, a weaker current is required, so that the electrodes will have a substantially longer useful life.

Abstract: An HID single light emitting point lamp tube switching device for switching the lamp tube between a far light position and a near light position is disclosed. Initially, a strong current coil and a weak current coil are induced at the same time, so that the HID single light emitting point are moved to the second position, and at end of a time period set in the timer, the strong current coil will be interrupted so that only the weak current coil is actuated to maintain the HID single light emitting point in the second position.

Abstract: A vehicular lamp used in a vehicle, includes: a light source for emitting light in accordance with a voltage given thereto; a light-source controlling transistor for controlling power supplied to the light source by repeatedly switching whether or not the power is supplied to the light source; a capacitor having one end grounded and another end at which a potential is changed like a saw-tooth by charging and discharging of the capacitor; a capacitor controlling transistor for controlling a timing at which the charging and discharging of the capacitor is switched; and a comparator for comparing the potential at the other end of the capacitor to a reference voltage given thereto and controlling a timing at which the light-source controlling transistor is turned on or off and a timing at which the capacitor controlling transistor is turned on or off in synchronization with each other based on the comparison result.

Abstract: An apparatus for controlling power supply for use in a vehicle causes a lamp load to blink by power supply from an in-vehicle battery or generator. The power to be supplied to the lamp load is stepwise decrease whenever a blinking time of the lamp load passes prescribed times. In this configuration a lamp load can blink for a longer time without saving power excessively.

Abstract: A universal fleet electrical system includes a central power distribution panel, which includes a fuse panel and a lighting selector junction box, together with a universal wiring harness. A dash mounted console is provided for operator control of accessory devices. The console may include a keyed switch interconnected with a security power control relay for enabling a user to connect and disconnect power to the universal wiring harness. Power may be connected and disconnected to the universal wiring harness through the use of a master switch with a circuit breaker. The lighting selector junction box permits various lighting accessories to be connected to different light level circuits. The universal wiring harness may include a plurality of plug and play connectors to facilitate rapid attachment/removal of external accessories. A serial interface may interconnect the wiring harness with the fuse panel.

Abstract: A system 10 for controlling automatic headlamps within a vehicle which allows an operator of a vehicle to selectively program the amount of time that the exterior headlamps of the vehicle remain illuminated after the vehicle's ignition switch 18 is turned to the “OFF” position or the “exit delay” of the system 10. System 10 utilizes a controller 22 to monitor the positions of ignition switch 18 and headlamp switch 16. If the positions of switches 16 and 18 match a certain sequence within a predetermined period of time, system 10 initiates an “exit delay” programming period which is selectively terminated by a user. Controller 22 uses the programming period as the new “exit delay” for the system.

Abstract: In a discharge lamp apparatus, a casing of an electronic controller unit for a discharge lamp is comprised of a resin casing and a metal casing and accommodates therein circuit components for generating a voltage supplied to the discharge lamp. The resin casing couples with and contacts with the connector part of the discharge lamp. A power MOS transistor is attached to the metal casing through a plate member made of an insulating material. With this arrangement, heat generated by the discharge lamp is less likely to transfer from the resin casing to the metal casing, and heat generated by the power MOS transistor is efficiently radiated from the metal casing to the outside.

Abstract: A head lamp device includes: a swivel lamp 3R, 3L having a projector lamp 30 capable of controlling an irradiating direction or an irradiating range of light emitted from a light source 17; an actuator 4 including a brushless motor and a gear mechanism for deflecting the projector lamp 30; a Hall element for detecting a rotary range of the brushless motor; and an abnormality judgment means for judging an abnormality of the actuator 4 according to a rotary range of the brushless motor detected by the Hall element when the brushless motor is driven according to a predetermined condition. A cause of the abnormality of the actuator 4 can be properly judged without using a potentiometer, and AFS can be properly controlled.

Abstract: A circuit and method for providing closed loop control using constant current switching techniques is disclosed herein. By controlling the current supplied to high intensity light emitting diodes (LEDs) using the techniques and circuits described, high intensity LEDs can be operated at or near their maximum capacity without danger of overloading the LEDs, and without using excess amounts of current. A circuit as described herein, has multiple high side switches, each of which is connected to an LED array. The LED arrays are in turn connected through an inductor to a current switching control section that switches current to ground, or recirculates the current to maintain LED current flow within a desired range.

Abstract: An auto leveling apparatus which drives a motor only in case that a posture that has changed during stoppage becomes stable and the stable posture is different from the posture controlled at the last time thereby to reduce the number of operations of the motor.

Abstract: A highway light with an automatic backup lighting system includes a voltage supply, a switching mechanism electrically connected with the voltage supply, a current sensing device electrically connected with the voltage supply and the switching mechanism, a primary lamp electrically connected with the current sensing device and the voltage supply, and a secondary lamp electrically connected with the switching mechanism, wherein the current sensing device activates the switching mechanism to direct voltage to the secondary lamp when the current sensing mechanism senses low amperage from its connection with the primary lamp.

Abstract: A system for automatically controlling continuously variable headlamps on a controlled vehicle includes an imaging system capable of determining lateral and elevational locations of headlamps from oncoming vehicles and tail lamps from leading vehicles. The system also includes a control unit that can acquire an image from in front of the controlled vehicle. The image covers a glare area including points at which drivers of oncoming and leading vehicles would perceive the headlamps to cause excessive glare. The image is processed to determine if at least one oncoming or leading vehicle is within the glare area. If at least one vehicle is within the glare area, the headlamp illumination range is reduced. Otherwise, the illumination range is set to full illumination range.

Abstract: A metal halide discharge lamp can include a light emitting tube having a discharge chamber formed in the light emitting tube and containing no mercury. A pair of electrodes can be provided with a portion, which projects into the discharge chamber. The discharge chamber can include a buffer gas, which also acts as a starter gas, of xenon (Xe) in an amount of 7-20 atmospheres at room temperature, and at least one kind of metal halide. The light emitting tube can have a positive resistance range in current-voltage characteristics relative to a varying input electric power. In the positive resistance range, the light emitting tube can be driven by an electric power which is less than or equal to a rated power supplied during steady lighting. In the metal halide lamp of the invention, even if the input electric power to the light emitting tube is varied, sudden unintentional extinguishment does not occur, and varying range of light color can be narrowed.

Abstract: A vehicle light apparatus includes: a power consuming means provided in parallel with a group of light emitting elements for causing a total power value including power consumed by the lamp to become a normal power value, a breakage detecting means for detecting a breakage with respect to the group of light emitting elements, and a control means for controlling power supply to the group of light emitting elements, wherein in the event that a breakage of the group of light emitting elements is detected by the breakage detecting means, a power supply to the lamp including the group of broken light emitting elements is stopped or power supplied to the lamp is reduced by the control means. By providing the power consuming means, the load characteristic can be made constant, and power consumption can be reduced when a breakage of the light emitting element is detected.

Abstract: A high pressure discharge lamp includes a light-transmissive ceramic discharge vessel with an envelope having a maximum outer diameter D1 and open ends, a metal pipe having one end, i.e., a top end fused in the open end of the light-transmissive ceramic discharge vessel and the other end, i.e., a base end protruding from the light-transmissive ceramic discharge vessel, a pair of electrodes each having one end, i.e., a base end connectively supported on the base end of the metal pipe and the other end, i.e., a top end extending within the light-transmissive ceramic discharge vessel, and a discharge agent which is filled in the light-transmissive ceramic discharge vessel, wherein it is also characterized by that the high pressure discharge lamp has an overall length L1, and the overall length L1 and the maximum outer diameter of D1 satisfies a following equation. 1.5≦L1/D1≦4.

Abstract: A vehicle lamp has light sources having light emitting diodes that are vertically and horizontally disposed in the form of a square. A first LED group is disposed in the central position of the light source and is turned on in the tail lamp lighting mode. A second LED group surrounds the first LED group, and is turned on together with the first LED group in the stop lamp lighting mode. Thus, the light source appears as if the LEDs became luminous around the central position of the light source in any lamp lighting mode.