Abstract: A control device may be configured to be installed in a three-way screw-in socket that includes multi-position switches. The control device may be configured to control one or more lighting loads in response to the respective positions of the multi-position switches of the three-way screw-in socket. The lighting loads may include a lighting load that is integral with the control device, a lighting load that is installed in a threaded receptacle of the control device, and/or one or more lighting loads controlled by respective devices that are associated with the control device. The control device may include a wireless communication circuit that is configured to transmit messages in response to operation of the multi-position switches into respective positions. The control device may be configured to control the lighting loads in response to messages received at the wireless communication circuit.

Abstract: A method includes detecting, by a mobile device, a light sequence emitted from a plurality of light emitting diodes on an access point and determining, by the mobile device, an identifier for the access point based on the light sequence. The method also includes reporting, by the mobile device, a geospatial location of the mobile device and the identifier for the access point to an automated frequency coordination (AFC) server to perform AFC for the access point.

Abstract: A controller for controlling at least a first lighting device and a second lighting device, the controller comprising a communication unit for communicating with the first and second lighting device, a user interface for receiving user input, a display unit, and a processor for rendering, on the display unit, a graphical representation of a first color spectrum, a first type of graphical representation of the first lighting device in the first color spectrum at a first position in the user interface, a second type of graphical representation of the second lighting device in the first color spectrum at a second position in the user interface, wherein the first type of graphical representation is indicative for the first lighting device being arranged for generating light matching a color of the first color spectrum associated with the first position in the user interface, and the second type of graphical representation is indicative for the second lighting device not being arranged for generating light matchin

Abstract: Methods and systems for illuminating a path are described. Data indicating a condition can be received by a lighting device. A light for output by the lighting device can be determined based on a location of the lighting device, such as a location of the lighting device relative to the condition and/or an egress. Data indicating the condition and/or data indicating the light for output can be transmitted to one or more other lighting devices, thereby illuminating a path away from the condition to the egress.

Abstract: An aircraft emergency exit door indication system may comprise a first plurality of light sources, a controller, and a first sensor associated with a first exit door. The first sensor feedback signal indicates an availability for egress through the first exit door. The first plurality of light sources is operated by the controller based upon the first sensor feedback signal. The light sources may be lights that already exist in an aircraft such as ceiling wash lights, sidewall wash lights, floor path lights, dome lights, or passenger service unit lights. The system may include a second plurality of light sources logically separated from the first plurality of light sources based upon its location relative to the first exit door and a second exit door.

Abstract: A method of replacing one of a light module and a driver module of a light unit includes reading a VLC code from a data storage memory of one of the light module and the driver. The visible light communication (VLC) code is transferred, via a connection between the light module and the driver module, and stored in the other one of the light module and the driver module. One of the light module and the driver module is elected for replacement. The VLC code from the other one of the light module and the driver module is transferred to the replaced one of the light module and the driver module. The transferred VLC code is stored in the data storage memory of the replaced one of the light module and the driver module.

Abstract: A method for wireless power delivery, preferably including: determining transmitter-receiver proximity, assessing transmission parameters, and/or transmitting power based on a transmission plan. A system for wireless power delivery, preferably including a plurality of receivers and one or more transmitters.

Abstract: A traffic control monitoring and abnormality determination system and associated methods are disclosed for receiving and analyzing traffic controller input/output data during a learning phase to determine a model indicative of normal or healthy operation of the traffic controller in regulating traffic flow at an intersection and receiving and evaluating additional traffic controller input/output data against the model during an evaluation phase to determine whether an abnormality exists in operation of the traffic controller. If an abnormality is detected during the evaluation phase, the system may initiate a corrective action to resolve the abnormality such as sending an alarm signal to a traffic controller to cause the traffic controller to alter an operating state to resolve the abnormality.

Abstract: A method and system to extend the coverage of Outdoor Lighting Networks (OLNs) through the use of authorized mobile devices travelling around to establish a virtual connectivity link (i. e., storing data and, when in reach, using short-range wireless communication protocols) between isolated light points (or groups of light points) and connected light points so that lighting commands and data can be exchanged between the two sets of lighting points is disclosed.

Abstract: A traffic control monitoring and abnormality determination system and associated methods are disclosed for receiving and analyzing traffic controller input/output data during a learning phase to determine a model indicative of normal or healthy operation of the traffic controller in regulating traffic flow at an intersection and receiving and evaluating additional traffic controller input/output data against the model during an evaluation phase to determine whether an abnormality exists in operation of the traffic controller. If an abnormality is detected during the evaluation phase, the system may initiate a corrective action to resolve the abnormality such as sending an alarm signal to a traffic controller to cause the traffic controller to alter an operating state to resolve the abnormality.

Abstract: In a frequency modulated continuous wave (FMCW) radar apparatus, a transmitting section transmits a transmission signal and a receiving section outputs a beat signal. During this output period, a frequency-intensity property of a bias power supply voltage supplied from a power supply bias circuit is obtained. On the basis of determining whether or not the obtained frequency-intensity property satisfies a predetermined oscillation condition, it is checked whether or not there occurs oscillation in the power supply bias circuit.

Abstract: A policy-based OLN (outdoor lighting network) light management system including a central control apparatus (40); lighting unit control apparatus (50); a communication system (60) operably connecting the central control apparatus (40) and the lighting unit control apparatus (50); and a repository (70) in communication with the central control apparatus (40), the repository (70) being operable to store an OLN policy. The central control apparatus (40) is operable to: receive a policy; check the policy for consistency against the OLN policy; determine attributes and configuration commands for each of the lighting unit control apparatus (50) in accordance with the policy when the policy is consistent with the OLN policy; and communicate the attributes and the configuration commands for each of the lighting unit control apparatus (50) to a corresponding one of the lighting unit control apparatus (50).

Abstract: Systems and methods for creating and previewing a lighting effect, such as displaying an array of colors across a number of lighting fixtures are provided. A user may specify some of the colors for the array, as well as relative positions of the colors. A lighting management system determines transitional or intermediary colors and assigns the colors specified by the user, as well as the intermediary colors to the lighting fixtures. The resulting lighting effect may be displayed in a preview bar. The colors and the order of the colors may be edited to obtain a desired lighting effect.

Abstract: This invention relates to an illumination system (100) comprising a plurality of luminaires (101a-d). The luminaires are each arranged to transmit in the light emitted an identification code ID. To ensure sufficient detection of the identification codes during selection with a selection device (120), the system further comprises a control unit (130) which is arranged for identification of any luminaire which has a nominal drive value equal to or below a minimum preset value, or equal to or above a maximum preset value. The control unit sets (or instructs a driver to set) the nominal drive value of such identified luminaire to a predetermined value to achieve a corresponding predetermined light output from the luminaire ensuring a sufficient signal for the transmission of the identification code ID.

Abstract: A system and methods for automatically commissioning electrical fixtures using sound are disclosed. Electrical fixtures (140-149) detect sounds produced by a sound generator moved along a path (300) through installed fixtures according to a building plan (100). Each electrical fixture may be associated with a mapped fixture location in the building plan by correlating the detected sound with the location of the sound generator along the path.

Abstract: A method of retrieving status information of a lighting system includes propagating a command signal from a controller to a node of the lighting system by operating upstream transceivers that are upstream of the node in a transmitting mode and operating downstream transceivers that are upstream of the node in a receiving mode; propagating a reply signal including the status information of the LED unit of the node from the node to the controller by operating the upstream transceivers that are upstream of the node in a receiving mode and operating each of the downstream transceivers upstream of the node in a transmitting mode and reversing an operating mode of an upstream transceiver of a network segment from operating in a transmitting mode to operating in a receiving mode only when the downstream transceiver is operating in transmitting mode.

Abstract: An emergency lighting system with central batteries power remote LED fixtures and exit signs, with all components integrated throughout a single or multiple buildings. Status reports are available on demand and the system will generate written records required by the Life Safety Code. A wide range of fixtures optimized for emergency lighting are available for interior and exterior applications and all can be monitored via internet, with report displays available on any digital device. Easy access to batteries, automated testing, high lumen outputs, efficient optics and long lamp life ensure the lowest possible life cycle costs.

Abstract: The present invention provides a LED backlight driving circuit, a backlight module, and a liquid crystal display device, wherein, the LED backlight driving circuit comprises: a power module, a voltage converting module, a constant current driving IC module, and a boost module. The output terminal of the power module is connected with the power source of the constant current driving IC module through the voltage converting module; the output terminal of the power module is connected with the positive electrode of the LED strings through the boost module. The boost module is provided with an over voltage alarm unit used to warn that the voltage of the positive electrode of the LED strings is high. In the present invention, it can warn immediately and notice the failures when the output voltage of the LED backlight driving circuit is too high or the failure happens.

Abstract: Systems and methods for creating and previewing a lighting effect, such as displaying an array of colors across a number of lighting fixtures are provided. A user may specify some of the colors for the array, as well as relative positions of the colors. A lighting management system determines transitional or intermediary colors and assigns the colors specified by the user, as well as the intermediary colors to the lighting fixtures. The resulting lighting effect may be displayed in a preview bar. The colors and the order of the colors may be edited to obtain a desired lighting effect.

Abstract: A lighting management system for managing a light show displayed by at least one lighting fixture. The lighting management system includes a controller configured to receive at least one input related to a light show via one or more input devices coupled to the controller. The controller generates a light show based on the at least one input and renders a preview of the light show in a preview bar on a display device associated with the controller.

Abstract: A dimmer switch for controlling the amount of power delivered to and thus the intensity of a lighting load comprises a visual display operable to provide a visual indication representative of energy savings and usage information. The dimmer switch comprises an intensity adjustment actuator, such as a slider knob or a rotary knob, which may be coupled to a potentiometer for adjusting the amount of power delivered to the lighting load. The potentiometer may comprise a dual potentiometer including a resistive element and a conductive element having a cut. The visual display may comprise a single visual indicator, which may be illuminated a first color, such as green, when the intensity of the lighting load is less than or equal to the eco-level intensity, and illuminated a second different color, such as red, when the intensity of the lighting load is greater than the eco-level intensity.

Abstract: A lighting device for vehicle lights is provided that includes, but is not limited to LEDs arranged in a combined parallel/series circuit. A first photodiode is used to recognize the lighting of a first LED and a second photodiode is provided to recognize the lighting of a second LED of the plurality of LEDs.

Abstract: A LED lighting system and a controlling method using the same is disclosed. In accordance with the present invention, a central controller extracts an ID information assigned to each of one or more LED lighting devices using a power line communication and classifies the extracted ID information into ID groups according to a user command by assigning a management information thereto to enable controlling of the one or more LED lighting devices based on the management information.

Abstract: A multi-zone control system is provided. The multi-zone control system may include a system unit, zone wiring, a plurality of zone connection terminals and a first microcontroller. Each zone connection terminal may link at least one motion sensors and at least one security device to a first microcontroller. The first microcontroller may receive input when the at least one motion sensor detects movement of an occupant so as to activate the respective security device. A user may single-handedly install, operate and modify the multi-zone control system.

Abstract: The present invention provides a system and method for controlling at least one lighting system by means of a portable wireless remote control device. The system comprises a portable wireless remote control device, a lighting system controller, and at least one lighting system coupled to the lighting system controller. Each lighting system comprises one or more lighting modules (e.g., light emitting diodes (LEDs), incandescent bulbs, etc.). The portable wireless remote control device comprises a wireless transceiver, processor, memory, light control logic, user interface (UI), and an antenna. The lighting system controller comprises a wireless transceiver, processor, memory, light control logic, and an antenna. Each lighting system coupled (e.g., wired) to the lighting system controller may be wirelessly controlled via the remote control device.

Abstract: A control system controls the operation of at least a first and a second independently controllable LED light member. The control system includes a frame member on which a plurality of electrical components can be mounted, and at least one input port for receiving at least one of a power source and a command signal source capable of sending a command signal to at least one of the first and second LED light members. A first driver member is provided for conducting power to deliver conditioned DC power to the first LED member. A first driver to frame connector removably couples the first driver member to the frame member. A second driver member conditions power to deliver conditioned DC power to the second LED member, and a second driver to frame connector removably couples the first driver member to the frame member. A first external output port is coupled to the first driver, and a second external output port coupled to the second driver.

Abstract: A method for controlling guiding, signal or alert lights, particularly signal lights for an emergency escape route in a fire situation, in which method there are controlled sequentially arranged light sources, such as LED light sources. In the method, in the first step the sequentially arranged light sources (40), which are most advantageously arranged as a light source string (4) or at least as part thereof, are activated, on the basis of a signal received from a fire detector (3), to be switched to a first mode, in which first mode the sequentially arranged light sources are used for indicating the direction of an escape route, and/or to a second mode, where the light sources (40) are switched to emit continuous light. The invention also relates to a system and a device.

Abstract: A method and system for determining at least one property of a strobe cover are disclosed. The determined property of the strobe cover may then be analyzed to determine whether it is the proper property for the strobe device. The property of the strobe cover may include the color of the strobe cover (such as clear, blue, amber, etc.), the shape of the strobe cover (such as a strobe cover with a lens or a strobe cover without a lens), the material of the strobe cover, etc. The method and system may include determining the property of the strobe cover and checking whether the determined property is the expected property of the strobe cover (such as the expected color of the strobe cover). The strobe cover may include one or more property indicators. The one or more property indicators may interface with a circuit, such as mechanically interface with the circuit, in order for the circuit to determine the property of the strobe cover.

Abstract: Embodiments relate to controlling a lighting control according to at least one of received signal strength indication (RSSI) and a preset lighting mode. Brightness or/and color temperature of the lighting device may be automatically controlled to two or more levels according to the RSSI and a user's taste. A switch application of the lighting device using the RSSI is operated to facilitate a control by a user, and On/Off or/and brightness of the lighting device are controlled according to the RSSI.

Abstract: One or more example diagnostics may be performed by a network server for a network of intelligent luminaire managers or other radio frequency (RF) devices. The network server may receive messages or information from one or more of the plurality of networked intelligent luminaire managers or RF devices. The network server may perform diagnostics based upon the received messages or information from one or more of the plurality of networked intelligent luminaire managers or RF devices. The network server may also leverage knowledge of respective statuses of at least a portion of the plurality of the networked intelligent luminaire managers or RF devices to determine a system-level status.

Abstract: A method of controlling multiple street lamps with a mobile terminal includes receiving event information regarding a street lamp, among the multiple street lamps, from a gateway via an Internet in real-time. The event information indicates that a predetermined event has occurred in the street lamp. Notification information indicating that the event information has been received, is provided to a user of the mobile terminal in real-time. A control instruction for controlling the first street lamp based on control information input by the user, is transmitted to the first street lamp.

Abstract: A drive circuit for a color temperature tunable LED light source. An apparatus includes a current driver configured to output a first drive current to drive a first group of LED chips of the light source to emit first color temperature light and to output a second drive current to drive a second group of LED chips of the light source to emit second color temperature light. The apparatus also includes a controller coupled to the current driver and configured to control the first and second drive currents so that the first color temperature light and the second color temperature light combine to produce a resulting light having a selected color temperature and a selected intensity value.

Abstract: The invention relates to a lighting arrangement with an operating device (3) and with an LED light source (4) which is controlled by said operating device and which is formed by at least two LEDs (4a, 4b, 4c), which emit light of different colors and together emit a white total light. The operating device (3) drives some of the LEDs (4a, 4b, 4c) forming the LED light source (4) which are intended to emit monochromatic (non-white) light in such a way that said LEDs emit light signals representing certain operating parameters.

Abstract: The present invention is a remote controlled electronic ballast, which preferably includes: a ballast, counter, scheduling timer, remote control, digital display screen, ignition control, and diagnostic circuitry. The counter preferably tracks the total hours in which the ballast has operated. This count may be displayed, if requested on the digital display screen. The scheduling timer preferably triggers the ballast to ignite and/or drive the lamp at various time intervals. The remote control preferably allows the user to wirelessly: (1) set the wattage output; (2) control the timer settings; (3) display the count; and/or (4) turn the lamp on or off. The display preferably provides visual information of the ballast's setting. The ignition control preferably allows the user to start up multiple lamps in a series to prevent the breaker from being tripped. The diagnostic and sensory circuitry preferably performs a pre-ignition check for fault conditions.

Abstract: End-of-life indicators for lamps, and methods for indicating the end-of-life for lamps, are provided. A solid state light source end-of-life indicator is located on the exterior of a housing of a lamp, and includes at least one light emitting diode. The solid state light source end-of-life indicator emits light at the end of the life of the lamp. The solid state light source end-of-life indicator may emit light upon receiving an end-of-life signal from an end-of-life detection circuit, which detects when the lamp is at an end of its life.

Abstract: A network of lighting elements controlled by a control system, in which the control system receives and analyzes operating conditions from the lighting elements in the network, from which it can determine whether any lighting elements are operating at unacceptable levels. The analysis is carried out by averaging the values received from the lighting elements to determine a baseline value and determining whether any deviate from the baseline value by more than a pre-determined amount. Alternatively, the analysis may be done by finding the distribution of the values and mode value, and determining whether any individual values are outside an acceptable distribution.

Abstract: A dimmer switch for controlling the amount of power delivered to and thus the intensity of a lighting load comprises a visual display operable to provide a visual indication representative of energy savings and usage information. The dimmer switch comprises an intensity adjustment actuator, such as a slider knob or a rotary knob, which may be coupled to a potentiometer for adjusting the amount of power delivered to the lighting load. The potentiometer may comprise a dual potentiometer including a resistive element and a conductive element having a cut. The visual display may comprise a single visual indicator, which may be illuminated a first color, such as green, when the intensity of the lighting load is less than or equal to the eco-level intensity, and illuminated a second different color, such as red, when the intensity of the lighting load is greater than the eco-level intensity.

Abstract: The present invention provides a system and method for controlling at least one lighting system by means of a portable wireless remote control device. The system comprises a portable wireless remote control device, a lighting system controller, and at least one lighting system coupled to the lighting system controller. Each lighting system comprises one or more lighting modules (e.g., light emitting diodes (LEDs), incandescent bulbs, etc.). The portable wireless remote control device comprises a wireless transceiver, processor, memory, light control logic, user interface (UI), and an antenna. The lighting system controller comprises a wireless transceiver, processor, memory, light control logic, and an antenna. Each lighting system coupled (e.g., wired) to the lighting system controller may be wirelessly controlled via the remote control device.

Abstract: The present invention relates to a control device adapted to control properties of light emitted from a light source. The control device may comprise a touch-sensitive user interface adapted to visually indicate a range of available values representing at least one of the properties and to enable a user to control the represented property on the basis of a location touched on the touch-sensitive user interface. The controlled property may be adjusted by means of a communication unit adapted to communicate to the light source control signals corresponding to user input. The user interface may comprise at least one discontinuity-indicating element adapted to visually indicate a step discontinuity in the range of available values representing the at least one property.

Abstract: This invention relates to an illumination system (100) comprising a plurality of luminaires (101a-d). The luminaires are each arranged to transmit in the light emitted an identification code ID. To ensure sufficient detection of the identification codes during selection with a selection device (120), the system further comprises a control unit (130) which is arranged for identification of any luminaire which has a nominal drive value equal to or below a minimum preset value, or equal to or above a maximum preset value. The control unit sets (or instructs a driver to set) the nominal drive value of such identified luminaire to a predetermined value to achieve a corresponding predetermined light output from the luminaire ensuring a sufficient signal for the transmission of the identification code ID.

Abstract: Coded light has been proposed to enable advanced control of light sources and transmit information using light sources. It is based on invisibly embedding of data and identifiers in their light output. Methods, devices and systems configured to efficient assignment of addresses in a coded lighting system, still allowing for unique identification, are proposed. More specifically, the assignment of addresses occurs in two phases, where in the initial phase wide area unique addresses are used, while in the second phase only local area unique addresses are used. Also, methods, devices and systems configured to efficiently distribute a set of addresses over a set of light sources in this second phase, to maximize the performance of the illumination contribution estimation, and positioning, are disclosed.

Abstract: A light adjustable lamp, related to the lighting facilities has a power module supplying power to a driving unit which is controlled by a Pulse Width Modulation signal. The driving unit supplies power to the lamp; the power module supplies power to the touch signal converter and the microprocessor control unit; the touch signal converter receives the sensing signal of on, off or level from the sense key on the touch sensing keyboard, and converts the sensing signal to the corresponding control level signal to the microprocessor control unit; the microprocessor control unit analyses the control level signal from the touch signal converter and transmits the corresponding Pulse Width Modulation signal to control the driving unit to cut off the power to the lamp or supply power to the lamp with active current in provided level.

Abstract: One or more example diagnostics may be implemented as part of an intelligent luminaire manager or other radio frequency (RF) device that is in communication with an equipment or fixture such as a luminaire. Example diagnostics can determine a status such as a fixture malfunction, a cycling condition, a miswiring configuration, or another condition. The determined status can be wirelessly transmitted from the intelligent luminaire manager or other radio frequency device to a network server via a network. The network may be a network of intelligent luminaire managers and/or RF devices.

Abstract: An exemplary embodiment of the present invention provides a method of lowering power consumption. The method includes temporarily disabling a plurality of status indicators on a plurality of electronic components without disabling the operation of the electronic components.

Abstract: A system involves a plurality of RF-enabled occupancy detectors. Each occupancy detector communicates with and controls an associated plurality of RF-enabled fluorescent lamp starter units. A network master has an RF transceiver used to communicate with the occupancy detectors using a first protocol, thereby retrieving status information from the starter units. The network master also has a second RF transceiver for communicating directly with a cellular telephone using a second protocol. A user can use the cellular telephone to control and interact with the lighting system through the network master, and/or to retrieve status information from the network master. The network master automatically generates and sends email alerts to the user by sending the alerts to an email server. The email server forwards the emails to the cellular telephone via a cellular telephone network. Alerts may, for example, indicate a low battery voltage condition or that a lamp needs replacement.

Abstract: An LED indicator device is mounted in an AC power plug or socket and electrically connected in parallel with an AC power source. The LED indicator device includes a driving/current-limiting circuit to which an LED lighting circuit is coupled. The driving/current-limiting circuit includes a driving/current-limiting capacitor and a discharge resistor connected in parallel with the driving/current-limiting capacitor. The LED lighting circuit includes an LED, a protective instantaneous current-limiting resistor coupled to the LED, a rectifying diode connected in parallel with the LED, and a protective instantaneous voltage-limiting capacitor connected in parallel with the LED. The LED is lit to show the position and on/off state of the AC power plug or socket. Three LEDs emitting different colors and associated driving/current-limiting circuits and associated LED lighting circuits can be utilized to indicate incorrect power connection or short circuit of the AC power plug or socket.

Abstract: A Style A PAPI system comprises a plurality of identical lamp housing assemblies, each with one or more lamps and each housing assembly including a tilt circuit. A master control includes a microcontroller that supplies an inverted 1 KHz, 50% duty cycle pulse signal to each tilt circuit through a corresponding blocking diode. Each of the tilt circuits includes an optical pendulum tilt switch that responds to tilting of the housing assembly. DC power is developed in each tilt circuit from one phase of the pulse signal. A pair of steering diodes and a voltage divider network enable return pulses to be supplied back to the microcontroller via the same wires that deliver the pulse train. The returned pulses exhibit different voltages corresponding to tilt and no tilt conditions of the tilt switch. Visual indications of the status of each tilt circuit are presented at the tilt circuits and at the master control.

Abstract: A user interface for a load control device allows a user to control an operating characteristic of a load to a plurality of discrete levels. The user interface comprises an adjustment member for allowing the user to select one of the discrete levels and a linear array of status indicators for displaying the discrete level. The number of discrete levels is greater than the number of status indicators. According to a first embodiment of the present invention, either one status indicator or two consecutive status indicators are illuminated to indicate the presently selected discrete level. According to a second embodiment, a fully illuminated status indicator is surrounded by two dimly illuminated status indicators to indicate the presently selected discrete level. According to a third embodiment, a single status indicator may be illuminated to indicate one or more of the discrete levels.

Abstract: A malfunction management unit (MMU) includes advanced diagnostic and set-up capabilities accessed through a display-based user interface. In general, the MMU is capable of displaying (1) monitor status information, wherein the monitor status information includes information relating to the status of at least a portion of the input signals; and (2) diagnostic information, wherein the diagnostic information includes an indication of fault type, and indication of faulty signals, and troubleshooting information associated with said fault type and relevant faulty signals. The diagnostic information includes a textual interpretation of the results of a field check analysis.

Abstract: A Style B PAPI system comprises a plurality of identical lamp housing assemblies, each with one or more lamps and each housing assembly including: an electronic bypass circuit with first and second oppositely poled SCRs coupled across the terminals of each lamp; a zener diode; and a diode bridge for developing a first trigger voltage across the zener diode in the event of failure of a lamp. The first trigger voltage causes alternate conduction in the first and second SCRs from the AC voltage developed across the failed lamp. A lamp control circuit includes a third SCR that is coupled across the zener diode for developing a second trigger voltage for similarly driving the SCRs. The lamp control circuit is operated by a microcontroller-controlled common lamp control circuit that activates all of the lamp control circuits and disable all of the lamps in response to a tilt condition for the lamp housing assembly.