Abstract: Apparatuses, methods, and systems for automatically commissioning lighting controls using sensing parameters of the light controls are disclosed. One embodiment includes a building control system. The building control system includes a plurality of sensors, a plurality of lights associated with the plurality of sensors, and a controller. The controller is operative to receive sense signals from the plurality of sensors, and generate a graph based on the sensed signals, wherein the graph includes nodes that represent light locations, and edges that represent distances between the lights. For an embodiment, the controller further operative to performing inexact graph matching between a floor plan graph and the sensor graph, thereby automatically commissioning the plurality of lights based on the sensed signals of the plurality of sensors.

Abstract: An LED based light assembly and lighting system is disclosed. The lighting system includes at least one light assembly comprising a plurality of LED chips, a controller and a power supply module. The controller is configured to receive an input signal and to provide an output control signal for controlling power to the at least one light assembly. The power supply module is configured to receive a standard voltage and current signal and to provide a power signal to the at least one light assembly to power the at least one light assembly in response to the control signal.

Abstract: A fixture comprising a light sensor and an actuator for assigning the fixture to at least one zone. A fixture comprising a light source, a motion sensor and a light sensor. A fixture comprising a motion sensor, a light sensor and a wireless transmitter (optionally also a wireless receiver). A fixture configured to detect light brightness values over a time-span, and identify a period of time with smallest average brightness. A fixture configured to dim at a first rate when a motion sensor senses no motion for a designated period of time, and optionally also configured to brighten at a second rate when the motion sensor detects motion. A fixture configured to dim to not less than a designated percentage unless motion is detected during the dimming. A lighting control system, comprising fixtures and an actuator configured to assign fixtures to zones. Also, other lighting control systems and methods.

Abstract: A light apparatus with a hybrid power supply device and method utilizing the same are disclosed. The light apparatus includes an LED module, a solar module, an auxiliary power module, a voltage level detection circuit, a first switch unit, and a second switch unit. When a voltage of a solar electric power generated by the solar module is greater than a predetermined value, the voltage level detection circuit provides an electrical connection between the solar module and the LED module for enabling a transmission of the solar electric power to the LED module. When the voltage of the solar electric power is smaller than the predetermined value, the voltage level detection circuit provides an electrical connection between the auxiliary power module and the LED module for enabling a transmission of an auxiliary electric power generated by the auxiliary power module to the LED module.

Abstract: The present invention is directed to an electrical device that includes a lighting circuit is disposed in the second housing and coupled to the voltage output terminals. The lighting circuit includes a control circuit coupled to a plurality of first light elements and at least one second lighting element. The plurality of first light elements is configured to provide a relatively wide illumination beam when energized by the control circuit in a first operational state, and the at least one second lighting element being configured to provide a relatively narrow illumination beam when energized by the control circuit in a second operational state. The control circuit is configured such that the first operational state and second operational state do not simultaneously occur.

Abstract: A modular lighting system (100) comprising a plurality of interconnected generally planar units (15, 115, 215), each unit having at least one illumination element (31), and an electrical circuit for connection to an adjacent unit and comprising a respective sensor (16, 17) associated with each illumination element, the sensor being arranged to be actuated by the presence of an article over or adjacent to the respective illumination element, and the system being controlled such that when the presence of one or more articles is sensed, the illumination is enabled of one of the illumination elements. Each unit has a further sensor (45) for detecting the approach of a person and illumination is effected only when both said presence sensor and said further sensor are actuated. The further sensor may be a proximity sensor, a vibration sensor or temperature sensing means.

Abstract: A light generating system comprising: a plurality of solid state emitters (SSEs) and a stability control system for controlling the spectral stability of the SSEs. In a particular case, the stability control system may comprise: a power regulator to regulate power supplied to a sub-set of the plurality of SSEs; a constant current circuit connected to the power regulator to provide a constant current to the sub-set of SSEs; a current regulation set point connected to the constant current circuit; and a controller configured to set the regulation set point based on metrology relating to the state of the SSEs.

Abstract: A luminaire with a light source, controller, and sensors to emit light into an environment is described. The controller may include a processor and memory to analyze data relating to conditions in the environment and to control the light source emitting light. The sensors may be in communication with the controller to detect conditions in the environment and generate data relating to same. The data may be receivable by the controller. Rules affect operation of the luminaire, which may be manipulated using an interface. The luminaire may communicate with devices connected through a network. Light and an auxiliary signal may be emitted substantially simultaneously to provide spatial awareness.

Abstract: Lighting systems including lighting fixtures having multiple light-emitting diode units and associated devices, systems, and methods are disclosed herein. A lighting system configured in accordance with a particular embodiment includes a plurality of lighting fixtures individually including first and second light-emitting diode units. The system further includes a power source, first wiring operably connecting the first light-emitting diode units to the power source, and second wiring operably connecting the second light-emitting diode units to the power source. An automatic controller is operably connected to the first wiring such that the second light-emitting diode units operate independently of the automatic controller.

Abstract: A lighting device includes a AC/DC or DC/DC power converter, a controller/processor electrically connected to the AC/DC or DC/DC power converter, a light emitting diode (LED) current control circuit communicably coupled to the controller/processor and electrically connected to the AC/DC or DC/DC power converter, and one or more LEDs electrically connected to the LED current control circuit.

Abstract: Plural luminaires are installed in a lighting space surrounded by a wall part. A sensor equipment detects existence or nonexistence of a person in the lighting space. If existence of a person in the lighting space is detected, the sensor equipment detects a direction of the person. The sensor equipment detects a distance between the wall part positioned in front of the direction of the person and the person. A lighting control unit selectively switches between a first control for performing lighting control of the luminaires to illuminate the wall part positioned in front of the direction of the person if the detected distance is a specified distance or less, and a second control for performing lighting control of the luminaires to reduce brightness at a place as the place becomes farther from a position of the person if the detected distance is larger than the specified distance.

Abstract: A wireless light sensor, being part of a lighting system, has a sensor element generating a light measuring signal, a microcontroller coupled to the sensor element, and a radio communication device coupled to the microcontroller. The microcontroller has an active mode and a sleeping mode. The light sensor further has a wake-up circuit which determines a rate of change of the light measuring signal, when the microcontroller is in the sleeping mode. The wake-up circuit brings the microcontroller from the sleeping mode into the active mode, when the rate of change of the light measuring signal exceeds a predetermined threshold.

Abstract: Technologies are described herein for an illumination device and a corresponding fixture device. The illumination device includes a luminary module for the emission of light and an identification circuit containing identifying data, while the fixture device includes a driver module for supplying power to the illumination device and a controller module. When the illumination device is connected to the fixture device, the controller module communicates with the identification circuit of the illumination device to retrieve the identifying data and causes the driver module to supply the appropriate power to the luminary module of the illumination device.

Abstract: The lighting system includes a plurality of controllers each configured to control one or more lighting apparatuses. Each controller is configured to associate a set of coordinates of a position in an image taken by an image sensor thereof with an address of the lighting apparatus selected as a control object of a particular controller out of the other controllers. Each controller is configured to, when a person is detected by the image processing unit thereof, determine the set of coordinates of a position of the detected person; and, when the lighting apparatus associated with the determined set of coordinates is the control object of the particular controller, send a control signal to the particular controller. The particular controller is configured to, upon receiving the control signal, light the lighting apparatus corresponding to the determined set of coordinates.

Abstract: A LED light string contains at least two LED light sets, an adjustable remote control, and a control host, each LED light set including at least one LED light series-connected, between the each LED light set and the control host being connected a transistor, wherein the adjustable remote control includes a button set, a subhost, and a TX transmitter module, the sub host includes a TX coding module f, and a variation of a pressed time and/or a pressing method of the control button generates a press signal received and coded by the TX coding module, a control signal is transmitted to the control host by the TX transmitter module to correspond to the press signal; the control host includes a RX receiver module and a host connected with the RX receiver module.

Abstract: A cone light is a light emitting structure that is placed on a traffic cone to improve the visibility of the traffic cone. The light cone includes a plurality of lights that are mounted to an outer surface of the cone light and a micro-controller that controls the illumination of the lights. The cone light also has a memory storing a plurality of flash patterns and the micro-controller illuminates the lights in the flash pattern selected by the user. Multiple cone lights can be used together with a master cone light transmitting a flash pattern signal to one or more slave cone light so that each of the cone lights is illuminated in a matching or coordinated pattern.

Abstract: In a light-installed area where a plurality of lights are installed, a light managing system senses a moving object that enters the light-installed area and predicts an predicted stop position of the moving object based on record information on a channel of movement corresponding to identification information on the moving object. The light managing system calculates a predicted channel of movement of the moving object based on the predicted stop position, and selects lights to be driven based on the calculated predicted channel of movement. The light managing system turns on the selected lights.

Abstract: A wall switch motion sensor detects motion using a lens and an infrared detector, and in response performs a function (for example, turns on a light). The motion sensor is also adapted to respond to IR remote control signals of the type customarily used to control electronic consumer devices in the home. In one example, a user uses an ordinary remote control device to transmit a sequence of IR control signals and dead times toward the motion sensor. The detector in the motion sensor detects each IR control signal as an increased amount of IR energy, whereas it detects a dead time as a period of less IR energy. If the periodicity of the sequence is appropriate, then the wall switch motion sensor determines that the sequence is an instruction. In one example, the instruction is to turn on/off the light controlled by the wall switch motion sensor.

Abstract: A detecting device includes at least one transmitter and plural receivers. After the at least one transmitter emits plural incident light beams to a detection zone, plural reflected light beams reflected from the detection zone are received by the plural receivers. If no object is moved within the detection zone, the plural reflected light beams strike a first part of the plural receivers, so that the plural receivers are in an initial reception configuration. If an object is moved within the detection zone, the plural reflected light beams are disturbed by the object and deflected to a second part of the plural receivers, so that the plural receivers are in a disturbed reception configuration. According to the reception configuration change, a moving direction of the object within the detection zone is determined. Consequently, the detecting range is largely enhanced, and the cost is reduced.

Abstract: Systems and methods are described for the control of lighting systems at individual light-fixture, local, regional, and larger-geographical-area levels that also distribute electrical power to consumers. One implementation comprises a hierarchical lighting-control system including an automated network-control center that may control up to many millions of individual lighting fixtures and lighting elements, regional routers interconnected to the network-control center or network-control centers by public communications networks, each of which controls hundreds to thousands of individual light fixtures, and light-management units, interconnected to regional routers by radio-frequency communications and/or power-line communications, each of which controls components within a lighting fixture, including lighting elements, drivers, sensors, and other devices. Systems and methods of using synthetic events for calibration and control of lighting systems are also described.

Abstract: A cone light is a light emitting structure that is placed on a traffic cone to improve the visibility of the traffic cone. The light cone includes a plurality of lights that are mounted to an outer surface of the cone light and a micro-controller that controls the illumination of the lights. The cone right also has a memory storing a plurality of flash patterns and the micro-controller illuminates the lights in the flash pattern selected by the user. Multiple cone lights can be used together with a master cone light transmitting a flash pattern signal to one or more slave cone light so that each of the cone lights is illuminated in a matching or coordinated pattern.

Abstract: The present subject matter is directed to a lighting control system and method. Motion or occupancy sensors are used to determine when a lighting fixture and/or a nearby lighting fixture should be activated. A controller associated with each lighting fixture switches its lighting fixture on and triggers a communications circuit to generate and send a signal to nearby lighting fixtures when a user is detected. Each lighting fixture also has a signal receiver to receive signals from any nearby lighting fixtures that are configured to communicate with it via a communication circuit. The present subject matter allows for a significant amount of energy to be saved as remote areas away from an occupied area do not have to be illuminated. Meanwhile, the user is still provided with a comfortable level of lighting in and near the occupied area.

Abstract: An energy saving LED lamp includes an illuminating device, a mode switching device, a motion detecting device and a controlling unit. The illuminating device is for emitting light. The mode switching device is for switching the illuminating device to work between an illuminating mode and a power saving mode. The motion detecting device is for detecting surrounding human motions and generating a first signal in condition that there is no human motion detected around the LED lamp within a predetermined period of time. The controlling unit is for receiving the first signal generated by the motion detecting device and automatically adjusting brightness of light generated by the illuminating device when having received the first signal, when the mode switching device is at the energy saving mode.

Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for cooperatively controlling ambient level lighting in a controlled area, and task-level lighting for task areas in the controlled area, where each task area is a separate sub-area of the controlled area.

Abstract: A video conference system provides “in the room” telepresence to near end participants. The video conference system includes a frameless or bezelless display device placed in front of a front wall for displaying edge-to-edge 3D images of far end participants. Color of the near end front wall is configured to be the same as the color of the far end rear wall. As a result, images displayed on the display device can merge or blend into the near end front wall, giving the near end participants the perception that the far end participants are actually in the near end conference room. Brightness of the faces/bodies of the near end participants can also be adjusted to match the brightness of the face/bodies of the images of the far end participants as they appear on the display device—therefore enhancing the in the room perception of the far end participants.

Abstract: A method for controlling grouped devices is disclosed. The method includes receiving a group setting from a group switch on each of the electronic devices, the electronic devices being divided into a plurality of groups according to the group setting of the group switch; a control device emitting a wireless signal comprising group data and operation data to the electronic devices; each of the electronic devices determining whether the group data matches the group setting of the group switch; and if the group data matches the group setting of the group switch, the electronic devices with the group setting matching the group data performing an operation according to the operation data.

Abstract: A method of eliminating interference at an optical sensor of a mobile device that receives light from multiple light sources. The mobile device includes an optical navigation module having a cover and an illumination device disposed around the periphery of the cover. The optical navigation module includes an optical sensor that detects light reflected from an object contacting the cover. A processor receives electrical signals from the optical sensor and interprets movement of the object. The method reduces interference between the light source of the optical navigation module and the light source of the illumination device by controlling emission of light rays from each light source. The emission of light rays may be controlled based on timing, frequency and/or coding domains.

Abstract: An light device, includes a plurality of first light cells arranged axisymmetrically about an axis; a plurality of second light cells arranged axisymmetrically around the axis; and a controller coupled to a brightness adjust unit, and determines whether to activate the first light cells and second light cells according to a brightness adjust value of the brightness adjust unit, wherein the average distance between the first light cells and the axis is shorter than the average distance between the second light cells and the axis.

Abstract: The present invention relates to an automatic lighting control system, and more particularly, to an automatic lighting control system which is capable of predicting a movement route of a resident in a complex building and automatically controlling lighting located in the movement route. According to the present invention, it is possible to reduce power consumption by simplifying configuration of lamps and controlling luminance of lamps on a resident or vehicle movement route by predicting motion of the resident or the vehicle through centralized control for a plurality of lamps, and to provide increased movement convenience and emotional satisfaction of a resident by showing the resident a movement route through lamps and securing a field of view on the movement route.

Abstract: A plant illumination apparatus includes a light source module including a first light source and a second light source generating lights having different wavelengths, an environment-detecting module detecting an external environment to obtain a real-time environment parameter, and a control module connected to the light source module and the environment-detecting module. The control module includes a processor unit and a storage unit storing a database of plant growing environment parameters. The processor unit loads at least one preset growing environment parameter corresponding to a plant growth timing from the database of plant growing environment parameters, and compares the preset growing environment parameter with the real-time environment parameter to output at least one comparison result. The processor unit adjusts the first light source and the second light source according to the comparison result, so that an adjusted environment parameter matches the preset growing environment parameter.

Abstract: A garden light having a body with a post, the lower end of which is provided with a spike. The upper end of the post receives a lens assembly. Secured to the lens assembly is a cap assembly that has three LEDs that are activated to produce a varying colour light.

Abstract: An illumination adjustment circuit includes a light sensitive unit, an amplification unit, a switch unit, and a light emitting unit. The switch unit includes a plurality of electronic switches with increasing threshold voltages. The light emitting unit includes a plurality of sets of light emitting diodes corresponding to the electronic switches. Each set of the light emitting diodes is connected to the amplification unit through one of the electronic switches corresponding thereto. The light sensitive unit detects the brightness of ambient light, outputting a first voltage to the amplification unit accordingly. The amplification unit amplifies the first voltage to a second voltage and outputs the second voltage to the switch unit, so that the electronic switches with the threshold voltages lower than the second voltage are turned on, and the set of light emitting diodes connected to the electronic switch becomes luminous.

Abstract: One or more embodiments include a light module having a reflective light source having one or more organic light emitting diode (OLED) elements. The reflective light source reflects light from other light sources and/or emits light when powered. The reflective light source includes control circuitry which senses the amount of light reflected or emitted and powers the light source based on an intensity of the sensed reflected or emitted light. In one embodiment, the reflective light source is used with a primary light source in the light module which may be in the form of a fluorescent light, direct sunlight, or diffuse daylight. The reflective light source reflects portions of light from the primary light source while the control circuitry senses an interruption or decrease in the power supplied to the primary light source and powers the secondary light source from an uninterruptible power source such as a battery.

Abstract: A lighting control system comprising a plurality of intelligent switches designed to replace a conventional light switch, each of the intelligent switches including a receiver configured to receive communication signals that include rules based instructions for controlling one or more lighting circuits; a circuit interrupter configured to control the amount of current flowing to a lighting circuit; a memory configured to store the rules based instructions; and a processor coupled with the receiver, memory, and circuit interrupter, the processor configured to control the operation of the circuit interrupter based on the rules based instructions stored in memory.

Abstract: An intelligent LED lamp group control device using an existing wall switch for controlling a group of LED lamps includes an AC power converter, an interface for intelligent control using an interface circuit for upgrading the existing wall switch for scene group control. The device further includes a night lamp control input port, an emergency operation switch, an external set control box connector, a wall switch input unit, a control configuration set interface, a power failure battery input port and a night lamp and RS-485 serial port. The device enables one single controller to achieve control of and provide power supply to multiple LED lamps, and uses a communication control interface for converting the power supply originally provided to the LED lamps into a logic control signal so that the wiring layout and location of the original lighting control wall switch can be used.

Abstract: A multi-view display device comprises a pixellated display panel and a backlight comprising an arrangement of light sources (30), wherein each light source, when turned on, illuminates an associated region of pixels of the display panel. A display controller is adapted to control the pixellated display panel and the arrangement of light sources such that a partial display output is provided comprising simultaneously a set of at least three 2D views with no repetition of individual 2D views. This arrangement provides an output with controlled illumination direction of the pixels so that view repetitions are avoided. The output can be a single cone of views, and the location from which the cone of views can be viewed depends on the relationship between the light sources of the backlight which are activated and the display panel.

Abstract: A system for adaptively controlling and adjusting the output and balance of multiple integrated illuminated panels may include a plurality of illumination sources in operative connection with a plurality of integrated illuminated panels, the plurality of illumination sources being disposed within a vehicle cockpit. The system may also include a dimming control configured to provide manual adjustment of brightness of the plurality of illumination sources, and a digital controller configured to automatically harmonize chromaticity and brightness of the plurality of illumination sources based on detected ambient lighting conditions.

Abstract: A controller for controlling a plurality of lighting devices configured for wireless communications in a facility includes a data communications interface communicating with at least one of the devices. The controller further includes a control module configured to provide a control signal to the data communications interface for communicating to a transceiver associated with the device and for turning off the device according to an algorithm wherein the control signal is provided based on a time of day and/or a sensed condition relating to use of the facility. The transceiver reports device data to the control module to quantify a reduction in power obtained by controlling the devices according to the algorithm.

Abstract: Disclosed embodiments relate to techniques for enhancing luminance resolution in a backlight unit. A backlight unit may have light-emitting diode (LED) light sources arranged in strings. In one embodiment, a backlight controller provides enhanced luminance resolution by drive each LED string at either first or second consecutive luminance values corresponding to first and second duty cycles of a pulse width modulation (PWM) signal. The outputs of the LED strings are optically mixed to achieve intermediate luminance values between the first and second luminance values.

Abstract: The present invention relates to a solid state lighting system which comprises at least one luminaire controller (208, 203), a plurality of light engines (201, 203; 301, 303) each being coupled to a plurality of light emitting devices (RG, B, A) and a single sensor (206, 306) coupled to each of the at least one luminaire controller (208; 308) for sensing the light emitted by the plurality of light emitting devices. The luminaire controller is adapted to control at least one of the plurality of light engines based on the sensing signal from the sensor (206, 306) such that a feedback control loop is implemented. A synchronization connection (205) is provided between the plurality of light engines (101, 103; 301, 303) to synchronize the plurality of light engines (101, 103; 301, 303).

Abstract: The present invention relates to an automatic lighting control system, and more particularly, to an automatic lighting control system which is capable of predicting a movement route of a resident in a complex building and automatically controlling lighting located in the movement route. According to the present invention, it is possible to reduce power consumption by simplifying configuration of lamps and controlling luminance of lamps on a resident or vehicle movement route by predicting motion of the resident or the vehicle through centralized control for a plurality of lamps, and to provide increased movement convenience and emotional satisfaction of a resident by showing the resident a movement route through lamps and securing a field of view on the movement route.

Abstract: An LED lamp (1) is employed in a state mounted on a lighting fixture. The LED lamp (1) includes an LED source portion (2) including a plurality of LED chips, an illuminance sensor module (12) detecting ambient illuminance, and a controller controlling the LED source portion (2) in response to illuminance of ambient light other than light emitted by the LED source portion (2) on the basis of an output signal received from the illuminance sensor module (12) when the LED source portion (2) is in a lighting-up state. When the LED source portion (2) is in the lighting-up state, there is a possibility that the illuminance sensor module (12) detects not only the ambient light illuminance but also spontaneous light illuminance. The controller eliminates influence by the spontaneous light illuminance, and controls the LED source portion (2) in response to the illuminance of the ambient light.

Abstract: In one aspect, the present invention is directed to an electric appliance control for turning off an electric appliance operating in an indoor space, the electric appliance control comprising: a light sensor, for continuously sensing the light intensity in the indoor space; a fall detector, for detecting a fall in the light intensity sensed by the light sensor, wherein the fall being a negative relative change in light intensity during a period of hundredths of second; a switch, for disconnecting the electrical power supply to the electric appliance; and a control unit, for activating the switch to disconnect the power supply upon detecting a fall in light intensity by the fall detector.

Abstract: A system wherein a control panel is used to set brightness, select an operation sensor (occupancy or light level), and provide a selection of lights off or reduced light for night conditions. A sensor control mode or a manual control mode may be selected. A sensor module comprises an occupancy sensor and light sensor used to monitor the ambient light at predetermined intervals Absent interrupts from the control panel, the sensor module or the control module, the system is idle. Whenever the system is in an on state, light from light fixtures is adjusted to compliment daylight to produce the user set brightness, thus reducing energy consumption. In an active mode, at least some light remains on, instead of powering off, during periods of system “off”. A delay timer provides time until the light is reduced or turned off entirely.

Abstract: A wireless pairing system and method are presented, the system having a network and a luminaire, which may include an electrical base, an enclosure, and a heat sink, as well as a light source, a network interface, a camera, and a controller in communication with the electrical base. The light source, the network interface, and the camera may be in communication with the controller, the controller having a central processing unit (CPU), and an input/output (I/O) interface. The controller, the camera, the light source and the network interface may be carried by the enclosure. The camera may capture an image having a configuration code associated with the network and the CPU may analyze the image to determine the existence of the configuration code. The CPU may then configure the network interface to connect the luminaire to the network so that the luminaire may be operated or monitored through the network.

Abstract: According to an embodiment of the present invention, a lighting system includes a low-voltage power supply (for example, including a transformer, solar cell, battery, etc.), power conductor(s) electrically connected with the low-voltage power supply, and two low-voltage light fixtures electrically connected to the power conductor(s). Each of the light fixtures has a respective control portion. The control portions simultaneously enable different operating modes for the first and second light fixtures. Such modes could include a constantly on/off mode, a dusk-to-dawn mode, a dusk to a time period after dusk mode, half-power dimming mode, or a motion detection mode.

Abstract: A control unit determines whether a vehicle has entered an area under a covering object that covers the upper side of the vehicle. In the case where the control unit determines that the vehicle has entered the area under the covering object, the control unit turns on light apparatus when both of a measurement of an upper light intensity, which is measured with an upper light intensity sensor, and a measurement of a front light intensity, which is measured with a front light intensity sensor, require turning on of the light apparatus.

Abstract: A system (100) for controlling a plurality of light sources (104a-f) by means of light groups, wherein each light group synchronously controls a subset of the plurality of light sources. The system (100) comprises: a central controller (102); a plurality of light sources (104a-f) wired to the central controller (102); and a light sensor (106a-c) wired to the central controller (102). The central controller (102) is configured to: receive a measurement signal from the light sensor; based on the received measurement signal, determine a subset of light sources that are in optical contact with the light sensor; and include the subset of light sources in a light group associated with the light sensor.

Abstract: A light fitting is provided with a first connector piece arranged to support a light and provide power thereto, an input connected to a power source and arranged to provide power permanently to an output comprising a primary coil, and a transmitter operable to transmit a switch signal. A light is provided comprising a sealed light housing, a light source, a back-up battery, a controller and a second connector piece having a secondary coil and a receiver. The receiver receives the switch signal and the controller controls power delivery to the light source in response to the switch signal received by the receiver thereby to turn the light on and off. The light fitting and the light are arranged to present the primary coil and the secondary coil for inductive coupling therebetween and to present the transmitter and the receiver for wireless communication therebetween.

Abstract: A lighting system includes a master that controls a plurality of light fixtures via wireless RF communications. An ambient light sensor in the master is used to monitor total ambient light and to prevent excessive illumination. In an auto-calibration process, the master makes ambient light measurements A, B and C when the light fixtures are illuminating an area at a minimum setting, at a maximum setting, and at an intermediate setting, respectively. A first threshold is set to be approximately (B?A). A second threshold is set to be slightly larger than (B?A)+(B?C). In normal system operation, total ambient light measurements are taken and compared to the two thresholds. In one example, if detected brightness is lower than the first threshold then the system is set at its maximum illumination setting, whereas if detected brightness is greater than the second threshold then the system is set at its intermediate illumination setting.