Abstract: The present document relates to a method and system for dimming low power illumination devices, such as LED (Light Emitting Diode) assemblies. A controller for a driver circuit of a light source is described. The driver circuit controls a plurality of illumination states of the light source using a power converter, which converts power from an input voltage waveform of a mains power supply into a drive signal for the light source. The controller comprises an event detection unit; a state register to store an indication of a current state of the illumination states; a state processor to determine a target state of the illumination states, based on the detected event and based on the current state; and an output control unit controls the power converter of the driver circuit to provide a drive signal for the target state.

Abstract: Described herein is an autonomous distributed lighting network which comprises a plurality of luminaires for providing lighting levels in accordance with idle dimming profiles, at least one sensor for sensing ambient conditions, and a communications network. Luminaire nodes, sensor nodes, a timer node and a controller node are connectable to the communications network. Each luminaire node is associated with a luminaire and is operable for receiving broadcast messages from the communications network, the luminaire overriding its normal idle dimming profile in response to an appropriate broadcast message. Each sensor node is associated with at least one sensor device and transmits broadcast messages onto the communications network in accordance with events sensed by each related sensor device. A timer node, if present, provides time synchonisation for the luminaires within the network. In addition, a controller node is used for set up and maintenance of the network.

Abstract: Provided is a circuit for adjusting light-emitting diode (LED) current; the circuit comprises: a single-output constant current source (21), a multi-path LED output circuit (22) and a control bus (20) connected to the multi-path LED output circuit (22); any given LED output circuit comprises: a load circuit (23), an adjustment circuit (24), a current regulation circuit (25) and an adjustment control circuit (26). The circuit for adjusting LED current provided in the technical solution of the present invention adjusts the current of each LED output circuit via the load circuit, the adjustment circuit, the current regulation circuit and the adjustment control circuit, thus adjusting characteristic parameters such as color, color temperature, color rendering index, brightness and the like of the LED light source, thereby avoiding the problem of high cost caused by using multi-path constant current DC/DC circuit to adjust the current of each path.

Abstract: A microcontroller-based multifunctional electronic switch uses a detection circuit design to convert external motion signals into message carrying sensing signals readable to the microcontroller. Based on the time length of sensing signals and the format of the sensing signals received in a preset instant period of time the microcontroller through the operation of its software program codes written in the OTPROM is able to recognize the working modes chosen by the external signal generating user and thereby selecting the appropriate loops of subroutine for execution. The system and method of the present invention may simultaneously be applicable to detection circuit design using infrared ray sensor, electrostatic induction sensor, conduction based touch sensor or push button sensor for performing multifunction such as controlling the on/off switch, the illumination power and the color temperature within the capacity of a single lighting device or an electrical appliance.

Abstract: A method for providing a light output from a lighting system (100) capable of emitting light within a lighting system color gamut (202) in an x-y color plane, comprising the steps of: receiving (302) a light output target comprising a target color point (210, 219) and a target flux; comparing (304) the target color point with the lighting system color gamut (202); and if the target color point is outside of the color gamut: determining (310) a first approximation color point (212, 220) inside the color gamut based on a minimization of a distance in the x-y color plane between the target color point and the first approximation color point; determining (312) a highest possible flux achievable by the lighting system at the first approximation color point; if the highest possible flux achievable by the lighting system at the first approximation color point is equal to or larger than the target flux, control (309) the lighting system to provide light defined by the first approximation color point and the target fl

Abstract: A switch mode power supply controller provides power to a pair of light sources. The controller includes a low voltage programmable current source and adjusting elements for independently adjusting the current to the LED light sources. The controller also includes a first communication port for receiving a communication from an external device, such as a dimmer, or from another power supply controller; and a second communication port for sending a communication to a third power supply controller. These ports provide an upstream and downstream communication capability through a chain of controllers so that input from a device can be communicated upstream and downstream.

Abstract: A lighting device, capable of identifying and marking traffic areas of airports, comprises at least one semiconductor lamp and an electronic control circuit, which is connectable to an electrical AC supply network with constant current feed. For controlling the operation of the semiconductor lamp, the control circuit has a rectifier, which is connectable without a transformer to the electrical AC supply network. It further has an internal power supply, which is connected to the rectifier, for supplying the semiconductor lamp with an electric direct current. Furthermore, the voltage supply device (3) having electronic power factor correction means, by means of which voltage and current can be kept in phase in all operating states of the lighting device (1). It furthermore re-adjusts the input voltage from the electrical AC supply network to allow the current predefined on the AC supply network to flow in the event of a small power demand of the electronic control circuit.

Abstract: Disclosed is a color lamp driving apparatus for generating illumination light of various colors by using a plurality of Red (R), Green (R), and Blue (B) lamps together with each other, having a color controller for generating a color control signal, which indicates driving time rates of R, G, and B lamp arrays, according to color information of required illumination light, and a lamp driving module for outputting a driving signal for driving each of R, G, and B lamp arrays according to the color control signal output from the color controller. The driving signal is set to apply driving times for the R, G, and B lamp arrays based on one among a start time point, a middle time point, and an end time point of each corresponding period ?T within one light-emitting period T.

Abstract: One embodiment of a display backlight driver integrated circuit can be configured for operation in at least two different ways. A first method transfers data from an EEPROM to hardware registers prior to regular operation. A second method also transfers data from an EEPROM to registers. However, hardware registers can be overwritten with data accepted from a control bus, prior to regular operation. A keyboard driver IC can detect the presence or absence of a cable to an LED. If the cable is absent, the driver IC will not supply power for the LED. One embodiment of a keyboard and display backlight control system can be configured to allow substantially independent operation.

Abstract: One embodiment includes a light-emitting diode (LED) control system. The system includes an LED driver system configured to regulate a control voltage based on a substantially constant reference current and a feedback voltage at a feedback node. The system also includes a digital current source system comprising a plurality of unit current sources that are each coupled to an LED. The plurality of unit current sources can be selectively activated to each provide a given unit current through the LED and to each provide the feedback voltage as an interpolative feedback to the feedback node based on the unit current. The system further includes a current magnitude controller configured to selectively activate the plurality of unit current sources in response to a current magnitude signal.

Abstract: An LED (Light Emitting Device) light source (100), a pulse controller or pulse control module (130) for an LED light source, and a method are provided, for controlling relative timing and phase of LED light pulse generation and operation of peripheral devices, relative to a common timing reference. A system is provided comprising a pulse controller (130) for controlling synchronization of multiple LEDs (144) and/or other devices and peripherals (164), relative to a common timing reference. The pulse controller (130) comprises a processor (131) that programmatically executes a time based sequence of digital control signals (141) from received inputs (121) indicative of a pulse generation sequence.

Abstract: A liquid crystal display device includes a backlight unit including an LED assembly, wherein the LED assembly includes: a plurality of LED packages; an LED PCB on which the plurality of LED packages are arranged being spaced apart from each other; and an LED driving circuit board that is connected to the LED PCB and includes a LED driving circuit, wherein the LED package includes first and second LED chips emitting two colors, respectively, out of red, green and blue, and a fluorescent substance emitting the other one color out of the red, green and blue, wherein a temperature sensor is formed in the LED PCB, and wherein the first or second LED chip is supplied with a compensated voltage according to temperature change by the temperature sensor.

Abstract: A light adjusting system for use with sport simulation equipment and a method of adjusting a state of operation of at least one light source used with golf simulation equipment is provided. The light adjusting system comprises a data interface, a light controller, an operations processor, and a storage device. The data interface is in communication with the sport simulation equipment. The light controller is in communication with at least one light source. The operations processor is in communication with the data interface and the light controller. The storage device is in data communication with the operations processor. The storage device includes at least one lighting profile. In response to communication between the sport simulation equipment and the data interface, the operations processor accesses the at least one lighting profile on the storage device and adjusts a state of operation of the at least one light source using the light controller.

Abstract: An illumination device with wake-up and/or fall-asleep functionality is disclosed. The illumination devices comprises at least one controllable light source; a control device for controlling the light source, wherein in a STEADY mode, color and intensity of the output light are maintained constant at a steady colour value and a steady intensity value and in and a WAKE-UP mode, the intensity of the output light is gradually increased from zero to the steady intensity value and in a FALL-ASLEEP mode, the intensity of the output light is gradually decreased from the steady intensity value to zero.

Abstract: A dual voltage and current control feedback control loop for an optical sensor system. A power supply provides a regulated DC voltage. A current source receives the regulated DC voltage and provides switched current to a light source. A current feedback representative of the current to the light source is provided to the power supply on a feedback path when the current source is driving the light source. A voltage feedback representative of the DC voltage is provided to the power supply on the feedback path when the current source is not driving the light source.

Abstract: The invention relates to a retrofit LED lamp (17) comprising a carrier (18) having at least one light-emitting diode (LED) (29), further comprising a driver circuit (12) for supplying power to the LED (29) and a socket (20) for electrically and mechanically connecting to a conventional lamp holder, characterized in that the retrofit LED lamp (17) comprises a carrier frequency system or power line communication (PLC) unit (16) connected to the electrical contacts (3, 4) and designed for receiving and/or transmitting data via the socket (20).

Abstract: The invention discloses an self-adaptive LED fluorescent lamp, comprising: a housing comprising a lampshade and a radiator fastened with each other, a Printed Circuit Board (PCB) consisting of one or more LED lamp sets and LED driving control units, and lamp caps sleeved on two sides of the housing; the LED driving control unit comprises a voltage detection module, an intelligent switching module and a linear constant current module; the voltage detection module comprises a first resistor and a second resistor, which are connected between two output ends of the rectifier filter module for voltage division, and a first capacitor connected with the second resistor in parallel; the intelligent switching module is connected with a common end of the first resistor and the second resistor, the output of the intelligent switching module is connected with a plurality of LED lamp sets, and each of the LED lamps is connected with a compensation resistor in series; and the linear constant current module consists of two

Abstract: A method for mixing light of LEDs includes following steps: Firstly, a substrate with a red light LED, a green light LED and a blue light LED arranged thereon is provided. Secondly, a power source for supplying power to the red light LED, the green light LED and the blue light LED is provided. Thirdly, a temperature variation ?T1 of the red light LED caused by the power source, a temperature variation ?T2 of the green light LED caused by the power source, a temperature variation ?T3 of the blue light LED caused by the power source are calculated. And finally, input currents applied to the red light LED, the green light LED and the blue light LED are adjusted according to the temperature variations ?T1, ?T2 and ?T3. A lighting device using the method is also provided.

Abstract: A system including a selection module to select one of a plurality of templates corresponding to a plurality of light emitting diodes, where the selected template includes one or more of temperature, current, and voltage characteristics of the plurality of light emitting diodes. A control module measures a voltage across one of the plurality of light emitting diodes; determines a temperature of the plurality of light emitting diodes based on the voltage measured across the one of the plurality of light emitting diodes and the selected template; and in order to maintain a luminosity of the plurality of light emitting diodes at a predetermined luminosity, adjusts current through the plurality of light emitting diodes based on the temperature, the selected template, and calibration data. The calibration data include current through the plurality of light emitting diodes and corresponding luminosities of the plurality of light emitting diodes.

Abstract: A dimming circuit and method for a LED provide a first driving voltage or a second driving voltage according to a dimming signal provided by a functional IC to enable or disable the LED. The values of the first and second driving voltages are controlled so that overstressing of the LED is avoided while the functional IC is capable of working even when the LED is off. The LED's life time is thus prolonged.

Abstract: An LED assembly (50) includes a plurality of LEDs including a first LED (52, 56, 60) of a first colour and a second LED (54, 58, 62) of a second colour. The assembly also includes a driver (53). The driver (53) includes a monitor (55) for monitoring a response of an LED, the absorption spectrum of which at least partially overlaps the emission spectrum of the first LED, and thereby obtaining an indication of the light output of the first LED. The assembly also includes a current supply (57). The driver (53) is configured to control the current supply to supply current to at least one LED of the plurality of LEDs in dependence upon the indication of the light output of the first LED whereby to maintain a desired colour mix of output light from the LED assembly (50).

Abstract: A method, apparatus, and user interface for providing a network based surround-light environment to dynamically drive lighting scenes are described. Location information of one or more illuminating elements relative to a display for presenting media information is determined. Lighting characteristic information for the one or more illuminating elements is determined. And a lighting profile for illuminating the one or more illuminating elements based on the location information and lighting characteristic information is determined.

Abstract: Described are various embodiments of an integrated fish diversion system, and lighting device used therein. One embodiment provides a system for diverting approaching fish from a predominant water flow path and toward a bypass. The system comprises a structural diversion assembly to be disposed across the predominant water flow path to guide the approaching fish along the structural diversion assembly to the bypass, while allowing passage of water through the structural diversion assembly along the predominant water flow path. The system further comprises one or more lighting devices to be cooperatively disposed in relation to the structural diversion assembly to further guide the approaching fish toward the bypass; and a controller operatively coupleable to the one or more lighting devices and operable to select an output spectrum thereof to optimize fish guidance thereby.

Abstract: There is provided a light emitting diode driving apparatus capable of supplying a constant average current to a light emitting diode by generating a reference voltage used for driving the light emitting diode according to input power and a switching signal switching a path of a current supplied to the light emitting diode. The light emitting diode driving apparatus includes: a reference voltage generating unit generating a reference voltage set based on input power and a switching signal for supplying driving power to a light emitting diode; and a driving unit supplying the driving power to the light emitting diode according to the reference voltage.

Abstract: At least one controllable source of visible light is configured to illuminate a space to be utilized by one or more occupants. A controller causes the source(s) to emit light in a manner that varies at least one characteristic of visible light emitted into the space over a period of time at least in part in accordance with a chaotic function.

Abstract: A remote controller is arranged for selecting a light source among a plurality of light sources. The remote controller has an omnidirectional transmitter and is arranged to instruct, by means of the omnidirectional transmitter, the light sources to transmit a directional signal comprising a code, which is unique for each light source. Further, the remote controller has a directional signal receiver, and is arranged to receive the directional signals from the light sources, and signal comparison circuitry connected with the directional signal receiver. The remote controller is arranged to select one of the light sources on basis of the received directional signals. Furthermore, the remote controller comprises a transmission indicator, which is arranged to generate an indication signal, indicative of a successful omnidirectional transmission, and it is arranged to initiate the selection of one of the light sources by means of the indication signal.

Abstract: Techniques for controlled dimming of an illuminant such as, for example, a light-emitting diode (LED), an organic light-emitting diode (OLED) or gas discharge lamp are described herein. In one example, a control difference formed by subtracting actual values from desired values (dimming values) is smaller than actual values fed back by the lamp. Thus, without directly digitizing an analog feedback variable, the example digitizes a control difference (control deviation) determined in the analog domain, in order to process the latter in a digital control algorithm that determines a digital manipulated variable that influences power to the illuminant.

Abstract: A lighting control system includes a plurality of luminaires and a control device (10; 10A; 10B). The plurality of luminaires illuminate a predetermined space. The control device executes first control for controlling a dimming degree of the luminaire arranged in a peripheral area in the periphery of a center area among the plurality of luminaires to be darker than the luminaire arranged in the center area and lighting the luminaires in the center area and the peripheral area and second control for controlling a dimming degree, according to predetermined conditions, of the luminaire arranged in a wall area, which is a position for illuminating a wall surface, among the plurality of luminaires to be brighter than during the first control.

Abstract: A lighting system according to an embodiment includes a plurality of lighting devices, and a host device which controls the lighting devices. In addition, the lighting system collects information according to a place where the lighting system is installed. Then, the lighting system performs, according to the collected information, a gradation control which turns on lighting devices at a periphery area which are installed on the periphery of lighting devices at a central area that are instructed to be turned on at a degree of dimming which is lower than a degree of dimming of the lighting devices at the central area.

Abstract: According to one embodiment, a lighting control system includes: a plurality of lighting apparatuses, a sound sensor and a control device. The plurality of lighting apparatuses illuminate a predetermined space. The sound sensor is disposed in the predetermined space and detects a voice of a person in the space. The control device is connected to the plurality of lighting apparatuses and the sound sensor, and controls at least one of a light color and a dimming degree of the plurality of lighting apparatuses depending on quality of the voice of the person that is detected by the sound sensor.

Abstract: A lighting power supply device receives a voltage converted from an alternating current to a direct current by a rectifying circuit rectifying the alternating current whose phase is controlled by a phase control type dimmer, and generates and outputs a direct current voltage/current to be supplied to a load. The lighting power supply device includes: a control circuit, and the control circuit gradually decreases a current drawn from the rectifying circuit from a predetermined current value set in advance, determines a current value immediately before detecting a malfunction of the phase control type dimmer as a drawn current value, and performs current control so as to maintain the determined current value.

Abstract: A light string power module is provided for providing power to light strings while replicating a lighting pattern from a first light string in providing said power. The illumination pattern of the first light string, which is not powered by the light string power module, is detected by examining the voltage polarities presented on the leads of a first connector to which the first light string is attached. These detected polarities are replicated by a switching module at matching leads on a second connector to which a second light string is attached. A power processing module accepts input power and provides output DC power to the switching module such that the second light string is powered by said output DC power in concert with the replicated voltage polarities so as to replicate the light pattern presented by the first light string on the second light string.

Abstract: A power-supply device includes a rectifying unit configured to rectify a phase-controlled AC voltage; a current limiting unit including a current limiting resistor, which limits an input current flowing from the rectifying unit at rise of a rectified voltage outputted from the rectifying unit; and an adjustment unit configured to cause the current limiting unit to limit the input current flowing from the rectifying unit until a predetermined time period has elapsed after an input of the AC voltage to the rectifying unit is started.

Abstract: An illumination system verifies controls the operation of a luminaire without the use of any photometric data. The illumination system uses data indicative of a current time, date or latitude to determine one or more aspects of a solar event. Such aspects can include a scheduled, predicted or expected time of occurrence of the scheduled solar event. Responsive to the determination of a scheduled, predicted or expected time of occurrence of the scheduled solar event, a control subsystem can adjust the luminous output of a light source.

Abstract: A bedside lamp, features for such a lamp, and associated methodology. The lamp has at least two different sets of lighting elements, each having one or more groupings of LED lamp(s), where the one or more main LED lamp(s) provide the majority of the lighting when the lamp is at full brightness and no lighting during various reduced lighting states, and the one or more “auxiliary” LED lamp(s) provide less than a majority of the lighting when the lamp is at full brightness and all of the lighting during various reduced lighting states. The lamp has the means for the user to set a dimming time for which the lights dim from a set brightness to 0% brightness, and means to gradually dim the main and auxiliary LED lamp(s) according to the above description.

Abstract: Various embodiments may relate to a circuit arrangement for operating at least one discharge lamp having a commutation device and a control device which is coupled to the commutation device. A first measuring device is used to determine in each case first measurement values, which represent a measure of the magnitude of electrode peaks of the discharge lamp, within a test operating phase in which the first electrode and the second electrode are supplied with energy in an asymmetrical manner. A second measuring device is used to determine a second measurement value which is correlated with the current through the discharge lamp at least during the test operating phase. The control device is designed to actuate the commutation device at least as a function of the determined first measurement values and second measurement values. Various embodiments further relate to a corresponding method for operating at least one discharge lamp.

Abstract: A flash driver to limit a load current for a flash comprises a dc/dc converter (DCDC) having a first input (IN1) to receive an input voltage (Vin) and an output (OUT) to supply an output voltage (Vout). The dc/dc converter is designed to convert the input voltage (Vin) to the output voltage (Vout). Furthermore the flash driver has an adjustable current source (Iadj) connected between the output (OUT) and a load terminal (LT). A first control unit (CTRL—1) is connected to the first input (IN1) and coupled to the adjustable current source (Iadj), and is designed to compare the input voltage (Vin) to a threshold (Vth) and, if the comparison indicates the input voltage (Vin) being smaller than the threshold value (Vth), adjust the adjustable current source (Iadj) such that the input voltage (Vin) is equal or greater than the threshold value (Vth).

Abstract: A method of selecting a light source among a plurality of light sources by means of a remote controller includes the remote controller: instructing, by omnidirectional transmission, the light sources to each transmit a directional signal comprising a code, which is unique for each light source; —receiving the directional signals from the light sources; and selecting one of the light sources on basis of the received directional signals. Furthermore, the method includes: generating, remotely of the light sources, codes to be transmitted by the light sources; and—the remote controller instructing each one of the light sources which one of the remotely determined codes to transmit.

Abstract: An illumination system includes a plurality of illumination apparatuses, each of the illumination apparatuses including a light source, a detection sensor for sensing presence and absence of a moving object, a wireless communication unit for transmitting a sensing signal of the detection sensor to other illumination apparatuses and for receiving a sensing signal from other illumination apparatuses and a control unit for controlling an output of the light source based on the sensing signal of the detection sensor or the sensing signal transmitted from other illumination apparatuses. If the detection sensor of one of the illumination apparatuses senses the moving object, at least one of remaining illumination apparatuses is controlled together by the sensing signal wirelessly transmitted from said one of the illumination apparatuses.

Abstract: This invention relates to a method of adjusting the fixture color emitted by a first and a second lighting fixture to a target color, each lighting fixture comprising at least a first and a second light source emitting light having different source colors, and said fixture color is obtained as a combination of said source colors, and said fixture color can be varied by varying the intensity of each light source; where the adjusting of said fixture color to a target color is performed by varying the intensity of said light sources based on both a first color gamut and a second color gamut respectively described by said source colors from said first lighting fixture and said second lighting fixture. The invention further relates to a light adapter and light system for adjusting the fixture color emitted by a first and a second lighting fixture to a target color and to a computer-readable medium having stored therein instructions for causing a processing unit to execute said method.

Abstract: An embodiment of the invention provides a lamp comprising a first emitting device, a second emitting device, and a control signal generation device. The control signal generation device generates a first control signal and a second control signal to control the first emitting device and the second emitting device, so that a first light flux generated by the first emitting device is equivalent to a second light flux generated by the second emitting device, wherein the second control signal is generated according to the first control signal.

Abstract: A lighting assembly to be primarily used in an agricultural setting to illuminate farm animals with different colors of lighting. The assembly has a circuit for emitting light with different colored light emitting diodes that are arranged in networks of LEDs. The second and third networks are arranged in parallel to a first network of LED forming three separate current paths for lighting the LEDs. Each path has controllable impedance element arranged in series with the network of LED in that particular path and is controlled by a dynamic impedance control element that is coupled to the controllable impedance element to direct current through the individual paths of the circuit.

Abstract: The present invention relates to a data generating system comprising a memory device (302), which comprises memory cells (306, 308) and a cell content access unit (310) arranged to access content in the memory cells and provide corresponding output data, wherein the output data originating from at least one of the memory cells (306) is changeable by means of an external physical effect acting directly on the memory device.

Abstract: A LAM/ICM assembly comprises an integrated control module (ICM) and an LED array member (LAM). The ICM includes interconnect through which power from outside the assembly is received. In a first novel aspect, active circuitry is embedded in the ICM. In one example, the circuitry monitors LED operation, controls and supplies power to the LEDs, and communicates information into and out of the assembly. In a second novel aspect, a lighting system comprises an AC-to-DC converter and a LAM/ICM assembly. The AC-to-DC converter outputs a substantially constant current or voltage. The magnitude of the current or voltage is adjusted by a signal output from the LAM/ICM. In a third novel aspect, the ICM includes a built-in switching DC-to-DC converter. An AC-to-DC power supply supplies a roughly regulated supply voltage. The switching converter within the LAM/ICM receives the roughly regulated voltage and supplies a regulated LED drive current to its LEDs.

Abstract: Disclosed is an LED driving circuit. The LED driving circuit includes a power supply, an LED array to receive a signal of the power supply, an IC connected to the LED array, and an inrush current restricting part to gradually increase an output current recognized in the IC. The inrush current restricting part comprises at least one of a frequency adjusting part and a current adjusting part.

Abstract: Systems, devices, and techniques are provided for operating a display and/or an illumination source based upon the direction of a user's gaze and/or a desired illumination level in a monitored area. One or more elements may be controlled with sensor input and application lighting preferences. For example, when a user receives a video call, light may be activated to illuminate their face. When the user is looking at the display, the display will be at the brightness necessary for the lighting conditions. When the user looks away from the screen, the screen may dim further and the lighting elements for the desk can brighten. Similarly, embodiments may adjust the lighting in a monitored location based upon lighting levels identified in other areas.

Abstract: A lighting system for providing high intensity lighting may include an LED system and a control system that controls the LED system based on a determined temperature to ensure that a minimum acceptable lighting value is provided at all times while thermally protecting the LED system. The high output lighting system has a lamp or luminaire equipped with the LED system producing a thermally regulated LED lighting system well suited for indoor and/or outdoor lighting applications such as portable and other light towers.

Abstract: The color of an LED-based lamp can be tuned to a desired color or color temperature. The lamp can include two or more independently addressable groups of LEDs associated with different colors or color temperatures and a total-internal-reflection (TIR) color-mixing lens to produce light of a uniform color by mixing the light from the different groups of LEDs. The color of the output light is tuned by controllably dividing an input current among the groups of LEDs. Tuning can be performed once, e.g., during manufacture, and the lamp does not require active feedback components for maintaining color temperature.

Abstract: In embodiments of the present invention, a method and system is provided for commissioning improved intelligent, LED-based lighting systems. The LED based lighting systems may include fixtures with one or more LED light bars, integrated sensors, onboard intelligence to send and receive signals and control the LED light bars, and network connectivity to other fixtures.

Abstract: An emergency lighting device, having a lighting device housing and power source, includes an illumination circuit powered by the power source. The illumination circuit is configured to trigger a first illumination mode having a first non-zero lumen output responsive to a first condition and a second illumination mode having a second, different, non-zero lumen output responsive to a second condition. In a preferred embodiment, the first non-zero lumen output is lower than the second non-zero lumen output. One or more light sources are retained within the lighting device housing and configured to provide illumination outside of said housing responsive to the first or second illumination mode. Finally, a signal detector retained within the lighting device housing is operative to trigger the second condition responsive to detection of a signal which, in a preferred embodiment is an audible signal such as a fire or smoke alarm signal.