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: System and method for adjusting brightness of one or more cold-cathode fluorescent lamps. The system includes a voltage selector configured to receive a dimming voltage and a first threshold voltage and generate an output voltage. The output voltage is selected from a group consisting of the dimming voltage and the first threshold voltage. Additionally, the system includes an oscillator coupled to a first capacitor and configured to generate a ramp signal with the first capacitor, and a signal generator configured to receive the ramp signal and the output voltage and generate a first signal. The first signal corresponds to a lamp brightness level. Moreover, the system includes a brightness detector configured to receive the first signal and output a second signal. The second signal indicates whether the lamp brightness level is higher than a threshold brightness level.

Abstract: A method and apparatus for metabolism manipulation of life forms using spectral output which comprises at least one array of LED light sources which have metabolic manipulating spectral emissions. The array sends one or more environmental signals selected from the group consisting of day/night cycles, seasonal cycles, competitive signals and harsh condition preparedness. A remotely programmable microcontroller is operatively connected to the at least one array for controlling the spectral emissions in a desired manner. The microcontroller selectively sending on commands, off commands and intensity commands to the at least one array. The method and apparatus include software for driving the microcontroller and the software is stored in a memory. A power source is operatively connected to the at least one array of LED light sources, and a graphic user interface facilitates inputting information, by an operator.

Abstract: An electronic device may be provided that has a display. The display may produce light using a backlight unit or using an array of light-emitting display pixels. An ambient light sensor may be mounted under an active area of the display to measure ambient light that is transmitted through the display. The display may be periodically disabled to prevent the display from producing light that interferes with the ambient light sensor. Display pixels may be coupled to a common cathode switch that can be periodically opened or the backlight in a display with a backlight can be periodically turned off. Control circuitry for periodically disabling the display while enabling the ambient light sensor may be implemented using a display driver integrated circuit mounted to a display.

Abstract: An illumination device includes a metal base substrate in a flat planar shape, a plurality of LED modules, and a driving unit which drives each of the LEDs arranged on the metal base substrate. The LED modules have an organic substrate, a plurality of LEDs which are arranged on the organic substrate, a metal member, LED control signal terminals which are set on the edge of the organic substrate, and voltage feed terminals which are set on the edge of the organic substrate. The metal member corresponds to each LED and to which the heat from the LEDs is conducted, and which is electrically connected via a switch element from an electrode of the LED, and which penetrates the organic substrate toward its width direction from the LED mounting surface of the organic substrate and is exposed from the opposite surface.

Abstract: Board level conditions associated with the operation of multiple LEDs are sensed and used to control a driver that powers the LEDs. The driver is controlled via a 0-10V control interface. The board-level conditions include, but are not limited to, temperature, ambient light, light intensity, operating time, time of day, current, and voltage. An on-board intelligent (OBI) controller processes the 0-10V control signal before it is provided to the driver to better control the LEDs. In some systems the OBI controller works in conjunction with a separate 0-10V controller that controls one or more luminaires.

Abstract: A method and system for storage of perishable items is provided. The system includes at least one enclosed compartment to store the perishable items. At least one of the walls of the enclosed compartment is detachable to allow movement of the perishable items in and out of the compartment. The system further includes a plurality of light emitting diodes (LEDs) that are disposed on one of the walls of the compartment. The LEDs include one or more blue LEDs that are coated with a layer of phosphor material. The LEDs are electrically coupled with a power source. The system further includes a control unit that is configured to control power supplied by the power source to the LEDs based on presence of the perishable items in the compartment.

Abstract: A method of estimating the occurrence of midnight on a given day comprises the steps of determining the average night length (NLAVE) by averaging the night lengths (NL) between a night starting time (NST) as determined by a photosensor and a night ending time (NET) determined by a photosensor for each of a plurality of days, and estimating midnight to occur at the time that is one half of the average night length (NLAVE) after the night starting time (NST) for the given day. This estimate of midnight to control the operation of lights or other equipment without the need for clocks or constant power.

Abstract: In the lighting control device according to the exemplary embodiment, the detection section detects the presence or absence of a person in a lighting area and a movement speed of a person, based on an image data of the lighting area that is lighted by a light source of a plurality of lighting apparatuses and is acquired from an imaging device. A decision section decides whether each of division areas is a stay area or a non-stay area based on the movement speed of a person detected by the detection section. A lighting control section performs different lighting controls on the lighting apparatus of the division area decided as the stay area by the decision section and the lighting apparatus of the division area decided as the non-stay area.

Abstract: Monitoring, command, control, and management of a street light may be provided. First, an amount of light may be determined. Next, a status of the street light may be determined based on the determined amount of light. Then, a current status of the street light may be determined. The current status may be compared with the determined status. Based on the comparison, the current status of the street light may be altered.

Abstract: In a light source device for combining light waves with at least three wavelengths and outputting thus combined light waves, an optical system element and an electrical system element are formed on a semiconductor substrate, thereby eliminating the necessity of optical members such as an optical connector, and saving space to place the optical members as well as reducing arrangement spacing. In addition, the space necessary for wiring in an electrical circuit is reduced. Therefore, an integration degree of each of the elements, the optical system element and the electrical system element, is enhanced. The optical system element and the electrical system element are formed in layers on the same conductor substrate, thereby reducing the area that is required in configuring a parallel establishment of the optical system element and the electrical system element.

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 control device may be adapted to enable the user to control a property associated with an activation area with the user interface upon activation of the activation area by the user.

Abstract: A wireless lighting module is disclosed. The wireless lighting module may include a light source, a controller configured to control illumination of the light source, a connector configured to provide power to an external device, and a battery configured to supply power to the light source, controller and connector.

Abstract: An LED lighting device includes at least one LED light source emitting light, at least one rechargeable battery for supplying power when external power is not available, at least one electrical connector for connecting the rechargeable battery to external power source for recharging, and at least one control mechanism for switching the operation mode of the device. By setting the operation mode via the control mechanism, the LED light device can be used for more than one intended purposes such as regular lighting, emergency lighting, and flashlight.

Abstract: A lighting fixture for lighting in a building includes processing electronics. The processing electronics are configured to cause the lighting fixture to provide increasing levels of illumination in response to state changes associated with sensed motion in the building.

Abstract: An automatic light regulating power supply device, connected between an AC power supply and a light-emitting-diode (LED) light string, to drive said LED light string to emit light, comprising: a sensing-and-setting unit, and a digital power control unit. Wherein, the sensing-and-setting unit is used to sense infrared signals, and generate a plurality of brightness selection signal. An AC/DC conversion circuit is provided in the digital power control unit, to convert the received AC power into DC power and output the DC power. The digital power control unit is connected to the sensing-and-setting unit, and regulates its power output based on infrared signals of the sensing-and-setting unit and the brightness selection signals, to vary illumination of the LED light string, in achieving energy conservation and lower power consumption.

Abstract: Disclosed is an illuminating device which has: a first illuminating lamp which is disposed at a first predetermined position and is identifiable; a second illuminating lamp which is disposed at a second predetermined position having a predetermined relationship with the first predetermined position and is identifiable; a determining means which determines the mutual relationship between the first illuminating lamp and the second illuminating lamp; and a transmitting means which transmits identifiable control signals to the first illuminating lamp and the second illuminating lamp, respectively, so as to achieve the determination made by the determining means.

Abstract: A strobe light includes a base, a mounting post, a plurality of light emitting diode (LED) lights, a control system, and a lens. The mounting post extends vertically from the base. The plurality of LED lights are mounted around a periphery of the mounting post. The control system is coupled to the plurality of LED lights and operable to independently control each LED light to produce at least one of a 360° strobe light pattern and a rotating beacon light pattern. The lens is connected to the base and covers the plurality of LED lights.

Abstract: A method for designing a lighting system, including: obtaining a selection of a color temperature (CT); obtaining, for the CT, a first spectral power distribution (SPD) corresponding to a low value color rendering index (CRI) and having a first plurality of peak wavelengths; obtaining, for the CT, a second SPD corresponding to a high value CRI and having a second plurality of peak wavelengths; and identifying a plurality of common peak wavelengths shared by the first SPD and the second SPD, where the lighting system includes a first plurality of light sources corresponding to the plurality of common peak wavelengths and a second plurality of light sources corresponding to a plurality of remaining peak wavelengths of the second plurality of peak wavelengths, and where the lighting system activates the second plurality of light sources in response to an event.

Abstract: Disclosed examples of optical systems having a plurality of light sources with each source having a different spectral outputs may be calibrated by measuring a spectral characteristic of the combined light with two measurements, e.g., one from a colorimeter and one from a sensor included in the system. Accordingly, one can determine a transform function in response to the two measures that models a feedback response of the optical system for each of a plurality of the inputs that would cause the optical system to generate radiant energy within a predetermined range of a spectrum. In order to calibrate the optical system, the transform function is programmed in the optical system to enable the optical system to transform an input to the optical system to a plurality of unique control signals each for controlling a respective light source of the plurality of light sources.

Abstract: The present invention discloses a lighting apparatus that includes a plurality of parallel circuits and a common circuit. The parallel circuits each comprise a switching transistor and a set of LEDs, the sets of LEDs having different characteristics such as different light output wavelengths. In operation, one of the parallel circuits is selected by activating the corresponding switching transistor, thus selecting the respective LEDs to be activated. The common circuit also comprises a set of LEDs, these LEDs being activated no matter which parallel circuit is selected. In various implementations, the lighting apparatus can generate a wide spectrum of light outputs by selectively activating the plurality of parallel circuits within time slots of a duty cycle. In some cases, balancing of loads across the parallel circuits is desired to maintain the appropriate current flowing through the LEDs.

Abstract: A synchronous light adjustment method and the device for performing the same are proposed. Each of plurality of lamps is installed with a light sensor and a control unit. By actuating a single power switch, the control unit will control the illumination of a respective one of the LED lamps independently and automatically based on the environmental illumination detected by a light sensor. Further, by switching the power switch manually to match predetermined operations, the control units will adjust the illuminations and color temperatures of the LED lamps synchronously and gradually. The device is convenient in installation and usage.

Abstract: A solar lighting apparatus and system, which is constructed into a street lamp, entrance lamp, garden lamp, nightlight, etc., includes a light emitting unit for providing illumination and a lighting apparatus body; a solar energy arrangement including a solar panel unit for light absorption and power supply; and a mounting plate; at least one ground supporting unit coupling with the mounting plate for securing the mounting plate onto a ground surface; and a light apparatus connecting unit provided through the mounting plate for firmly positioning the lighting apparatus, and a LED light control arrangement effectively controlling a power consumption in such a manner that the light emitting unit is arranged to being charged and discharged in a controlled manner and is protected against short circuit and overcharging, thereby maximizing power utilization, increasing lifespan and performance of the solar lighting apparatus.

Abstract: A system for enabling controlled plant growth of plants in containers includes linear tracks spaced apart from each other by intervening supporting plates. Each track includes an array of blue and red LEDs affixed to heat sink that can slide along the track to be positioned in a desired arrangement to the container beneath it. A controller for the LEDs is positioned between every other pair of tracks to control adjacent arrays of LEDs. The controller controls the LEDs to provide light to the plants in the containers of desired intensity and wavelength.

Abstract: A light-emitting diode (LED) lamp includes a number of different color LEDs that can be turned on and off in different combinations using an external switch operable by a user. A user or a controller can adjust the color temperature of light output by the lamp. The color temperature change may be a user preference and can compensate for decreased phosphor efficiency over time.

Abstract: An illuminance sensor setting device includes: an illuminance sensor that outputs a signal for switching a lighting apparatus, and a setting unit that performs setting of the illuminance sensor. The illuminance sensor and the setting unit are provided separately from each other, and are connected to signal lines. The setting unit has a configuration to set a sensor address of the sensor, a control address of the lighting apparatus, and an illuminance reference for switching the lighting apparatus. The setting unit transmits to the signal line the setting signal and the sensor address. Thus, even if the illuminance sensor is provided on, for example, the ceiling in the vicinity of the lighting apparatus, the setting unit can be provided at any place, such as a wall, where the setting unit can be easily operated, and work for settings is facilitated.

Abstract: An electronic control gear for operating at least one of at least one LED and at least one discharge lamp is provided. It may include a first terminal for coupling to a phase of an AC voltage supply; a second terminal for coupling to the neutral conductor of the AC voltage supply; a control input for coupling in a control signal of a control apparatus; a first output for coupling to the LED; a second output for coupling to the discharge lamp; a first driver circuit for the LED; a second driver circuit for the discharge lamp; an evaluation apparatus for evaluating the control signal at the control input, the evaluation apparatus comprising a microcontroller, which activates said driver circuits depending on the control signal, wherein a first capacitance is coupled between the second terminal and the control input.

Abstract: Environmental characteristics of habitable environments (e.g., hotel or motel rooms, spas, resorts, cruise boat cabins, offices, hospitals and/or homes, apartments or residences) are controlled to eliminate, reduce or ameliorate adverse or harmful aspects and introduce, increase or enhance beneficial aspects in order to improve a “wellness” or sense of “wellbeing” provided via the environments. Control of intensity and wavelength distribution of passive and active Illumination addresses various issues, symptoms or syndromes, for instance to maintain a circadian rhythm or cycle, adjust for “jet lag” or season affective disorder, etc. Air quality and attributes are controlled. Scent(s) may be dispersed. Hypoallergenic items (e.g., bedding, linens) may be used. Water quality is controlled. Noise is reduced and sounds (e.g., masking, music, natural) may be provided. Passive and active pathogen controls are employed.

Abstract: Methods and apparatus are disclosed for providing combined time-varying light comprising light from one or more light sources (132, 134, 136), and determining aspects of light from one or more light sources based on measurements of the combined light. Light sources of one or more colors can be controlled to provide time-varying combined light outputs (310, 360) using different switching sequences for different light sources, for example according to PWM, PCM, or other modulation methods. By appropriately configuring the timing of the switching sequences, the combined light output can be made to exhibit a plurality of lighting combinations. A broadband optical sensor (148) can be configured to measure (145) some or all of the plurality of lighting combinations, and the measurements used to determine light output measurements of portions of the combined light, and optionally of ambient light, by appropriate processing (150) of the measurements.

Abstract: An apparatus and method of detecting ambient light in a lighting system is provided. An OLED may be used to emit light and detect ambient light in such a system. Detection can occur during a time interval when light is not emitted from the OLED. Feedback to control the emitted light level of the OLED can be based on the detected ambient light.

Abstract: The present invention describes a solar powered garden lamp (100,100a,100b). The lamp (100,100a,100b) includes a lamp assembly, a solar panel (192), a rechargeable battery (150), a sunlight-hour switch (154), an LED (146a,146b) and a control circuit (140). In use, a user estimates the number of hours of sunlight incident on the solar panel (192) and the sunlight-hour switch (154) is calibrated by applying a weather variability factor on a battery charger (142) capacity that is connected to the solar panel. The solar panel (192) converts solar energy into electric power to recharge the battery (150) during the day so that the battery (150) has sufficient power to light up the LED (146a or 146b) at a predetermined brightness continuously from dusk to dawn.

Abstract: A lighting control system according to the embodiment includes a plurality of lighting fixtures, a lighting control unit, and an access point. The plurality of lighting fixtures are arranged in a lighting area. The lighting control unit is configured so as to control the lighting fixture. The access point transmits a layout chart of a different lighting area depending on an installation position of the access point.

Abstract: A self cooling light effects device for use in a standard light bulb socket having a socket adaptor, surface embedded LEDs as means to generate light effects, means to control light effects, and means for cooling. Fiber optic cables provide further light effects. Means to control 5 light effects may include a logic board. Means for cooling may be any combination of fans, heat sinks, heat pipes, thermoelectric cooling, a heat conductive filler, and a heat conductive housing.

Abstract: Included are embodiments for sensing and adjusting features of an environment. Some embodiments include a system and/or method that for receiving an ambiance feature of a source environment, determining from the ambiance feature, a source output provided by a source device in the source environment, and determining an ambiance capability for a target environment. Some embodiments include determining, based on the ambiance capability, a target output for a target device in the target environment and communicating with the target device to model the ambiance feature from the source environment into the target environment by altering the target output provided by the target device.

Abstract: A semiconductor lighting device has an array of semiconductor light sources arranged in an x-y grid, a power input in electrical connection with the array and arranged to provide power to the light sources, a microcontroller in electrical connection with the array arranged to alter operation of the array as necessary, and a connector in electrical connection with the microcontroller, arranged to provide an interface to the microcontroller. The semiconductor lighting device has a first interface to allow a first level of access to the microcontroller by an end user, a second interface to allow a second level of access to the microcontroller for maintenance operations, and a third interface to allow a third level of access to the microcontroller during production.

Abstract: According to one embodiment, a lighting control system includes a plurality of luminaire, a sensor device, a luminance sensor, and a lighting control unit. The luminaires are set in a lighting space. The sensor device detects presence of a person in the lighting space. The luminance sensor detects indirect luminance in a predetermined position in the lighting space by the luminaire. The lighting control unit subjects the luminaire to lighting control such that the indirect luminance detected by the luminance sensor does not fall below a predetermined value in a position where the sensor device detects presence of the person.

Abstract: A light detector arranged to determine a daylight contribution and an artificial light contribution to a combined illumination level wherein the artificial light comprises individual light coding modulation. The detector comprises:—a photo-sensor arranged to detect the illumination level at its position, and generate an illumination signal; and—a calculator, connected with the photo-sensor for receiving the illumination signal, and arranged to calculate the daylight contribution and the artificial light contribution and output corresponding daylight and artificial light signals. The calculator comprises:—an electronic filter arranged to prepare the illumination signal for estimation of the daylight and artificial light contributions;—a daylight part and an artificial light part, respectively connected to the electronic filter.

Abstract: Various embodiments of an LED dimming driver are disclosed herein. In some embodiments, an apparatus for dimmably driving at least one load includes a power supply having a voltage output, a controller having at least one current setpoint output, and at least one driver channel circuit connected to the voltage output of the power supply and to at least one of the at least one current setpoint outputs, the at least one driver channel circuit having a load output.

Abstract: A solid state lighting device comprising at least one first light emitter that emits non-saturated non-white light of a first color point, at least one second light emitter that emits saturated non-white light, and a controller configured to control a ratio of light emitted by the first emitter(s) and by the second light emitter(s) to provide non-white light of a second color point. Also, a solid state lighting device comprising at least one first light emitter that emits light within a first area or a second area on a Chromaticity Diagram, and at least one second light emitter, wherein output light is non-white and has a second color point. Also, methods of providing non-white light.

Abstract: The present invention discloses a backlight driving circuit applied to an electronic device. The backlight driving circuit includes a light-emitting diode unit, a photosensitive element, and a control circuit. The light-emitting diode unit has an anode terminal and a cathode terminal. The photosensitive element is coupled between the cathode terminal of the light-emitting diode unit and a ground, wherein the resistance of the photosensitive element changes with the ambient light level around the electronic device. The control circuit includes a sensing terminal and an output terminal. The sensing terminal receives a feedback voltage. The output terminal provides a power source to the anode terminal of the light-emitting diode unit according to the feedback voltage to control the luminance of the light-emitting diode unit, wherein the feedback voltage is decided by the resistance of the photosensitive element.

Abstract: A device that allows to turn on and off the lights of a house or room, offices or buildings, intelligently and automatically by detection without people manual intervention, more specifically, this device is provided with means for detect people entry and exit, media controllers or people quantifiers for entering or leaving a place or a room, allowing in a way to avoid unintentional lights on neglect, and in other way obtain efficiency and power saving, which does not occur with current on and off systems.

Abstract: An illumination system and method is disclosed. In one example, the illumination system comprises a light source, a controller controlling the power output of the light source, and a light sensor wirelessly communicating with the controller. In a normal mode, the controller controls the light source such that the light level remains substantially constant. In a change mode, the controller controls the light source such that the light level is gradually changed with a predetermined change rate so as to decrease a deviation from a target level, The controller switches from the normal mode to the change mode on the basis of input signals received from the light sensor. The light sensor measures a light level, and decides whether or not to communicate a signal to the controller. The light sensor refrains from transmitting a signal when receiving the signal does not cause the controller to change its control behaviour.

Abstract: Proposed is an illumination system (100) comprising a plurality of light sources (10) provided with encoders (20) arranged to enable light emitted from the light sources to comprise light source identification codes. In order to enable light effect commissioning, i.e. correlating the light sources (10) with their illumination footprints (11), the system further comprises a camera (40) arranged to register images of illumination spots (11), and a signal processor (111) arranged to derive the light source identification codes from registered images. Arranging the encoders (20) to modulate the light emitted at a frequency above a predefined high level to comprise fast codes (12) and at a frequency below a predefined low level to comprise slow codes (13), beneficially allows for the use of simple low cost camera systems.

Abstract: A lighting device and a method for adjusting the sensing region thereof are provided. The lighting device includes a sensing device and an illumination unit. The sensing device is configure to detect whether an object is located at a first manipulating region or a second manipulating region so as to correspondingly emit a control signal, in which the first manipulating region and the second manipulating region are not overlapped by each other and are disposed in the sensing region along a sensing direction of the sensing device. The sensing device adjusts a shortest distance between the sensing region and the sensing device and a sensing range of the sensing region according to a first adjustment signal and a second adjustment signal. The illumination unit is coupled to the sensing device and adjusts the optical characteristic according to the control signal.

Abstract: An illumination system verifies whether one or more aspects of an output signal provided by a photosensitive transducer fall within a threshold of an expected value for the aspect. The aspect may include a sunrise time, a sunset time, a dawn time, a dusk time, a solar noon time, a solar midnight time, or similar. Upon verification the illumination system uses a microcontroller to adjust one or more output parameters of a solid-state light source responsive to the output signal provided by the photosensitive transducer. Where verification is not possible, the illumination system uses the microcontroller to adjust one or more output parameters of the solid-state light source responsive to a schedule.

Abstract: The present disclosure relates to an LED-based lighting component that can control the color rendering capability of its generated light based on the presence or characteristics of ambient light. In one embodiment, the lighting component may employ at least two different types of LEDs to generate light. Control circuitry of the lighting component is able to monitor ambient light and drive the LEDs based on an ambient light characteristic that is indicative of the CRI of the ambient light. If the ambient light characteristic is indicative of the ambient light having a lower CRI, the control system will drive the LEDs to emit light with a defined CRI. If the ambient light characteristic is indicative of the ambient light having a higher CRI, the control system will drive the LEDs to emit light with a reduced CRI, which is lower than the defined CRI.

Abstract: Digital Control Ready (DCR) is a two-way open standard for controlling and managing next-generation fixtures. A DCR-enabled lighting fixture responds to digital control signals from a separate digital light agent (DLA) instead of analog dimming signals, eliminating the need for digital-to-analog signal conditioning, fixture-to-fixture variations in response, and calibration specific to each fixture. In addition, a DCR-enabled lighting fixture may also report its power consumption, measured light output, measured color temperature, temperature, and/or other operating parameters to the DLA via the same bidirectional data link that carries the digital control signals to the fixture. The DLA processes these signals in a feedback loop to implement more precise lighting control. The DCR-enabled lighting fixture also transforms AC power to DC power and supplies (and measures) DC power to the DLA via a DCR interface.

Abstract: Feedback is received from a plurality of devices. External data is also received. Statistical patterns of the plurality of devices are determined based on the feedback. A policy is determined based on the statistical patterns, the feedback, and the external data. The policy may include a set of rules dictating the operation of each of the plurality of devices and reducing energy consumption at the plurality of devices. Control data based on the policy is transmitted to the plurality of devices. The control data may be operative to transform the operation of the plurality of devices according to the set of rules.

Abstract: The invention is based on the idea that a lighting system can utilize its sensing and control functionalities to offer dynamic load management (e.g. demand response) services in an electrical grid. The present invention optimizes dimming levels of lighting sources of a lighting system by determining a solution for an optimization problem directed to determining new dimming levels such that power consumption of the lighting devices is reduced. During the determining the solution for the optimization problem, the present invention may take into account specific guarantees on illumination rendering, acceptable to different users, and differing illumination requirements in different spaces or rooms. By the lighting control of the present invention, predictable and effective load reductions may be achieved.

Abstract: The present invention relates to a light controller (102) configured to control a lighting system (100) for emitting light, comprising an image sensor (202) configured to capture an image of an activity area, and a control unit (200) configured to received the image, to detecting movement within the activity area, and to provide an activation signal for switching on a light source (104, 106, 108, 110) of the lighting system (100), wherein the control unit (200) is further configured to provide a deactivation signal for switching off the light source (104, 106, 108, 110) after a computed time period if no movement is detected within the activity area, the computed time period being based on a computed distance between a predetermined position within the activity area and a position of the latest detected movement within the activity area. The present invention provides advantages in relation to e.g.