Abstract: A backlight unit including: at least one light emitting diode (“LED”) string having an anode, which receives a string current, and a chassis-grounded cathode; and a current source control unit which receives a driving current and outputs the string current to the at least one LED string, where the current source control unit senses the driving current and compensates for the string current based on the sensed driving current and a reference voltage.

Abstract: A lighting and control system is described. One embodiment of the lighting and control system includes a controller. The controller may include an optical sensor configured to sense illumination from the lighting node, wherein the lighting node includes one or more light-emitting diodes; a memory configured to store a target color profile for the lighting node; and a radio device configured for radio communication with the lighting node including for communicating a color adjustment command to the lighting node based on the stored target color profile and the sensed illumination.

Abstract: A lighting system distinguishes between light from natural and manmade sources to prevent the system's light source from being inadvertently deactivated due to light received from manmade light sources. A sensor converts received light into electrical energy. The system light source and/or some other external light source can emit light with a modulation. The system includes a modulation detector that can detect the modulation in the electrical energy received from the sensor. A system controller selectively adjusts the flow of electrical energy to the system light source responsive to the electrical signals from the sensor. The controller adjusts the flow of electrical energy in response to the non-modulated component of the electrical signals from the sensor. The controller does not adjust the flow of electrical energy in response to the modulated component of the electrical signals from the sensor.

Abstract: A compensation circuit for keeping luminance intensity of a diode. The compensation circuit comprises a stabilization unit, a first transistor, a second transistor, a third transistor, a fourth transistor and an organic light emitting diode (OLED). The stabilization unit comprises a photodiode and a compensation capacitor. The second transistor is used to control the input time of data. In the operation of the OLED, the third transistor discharges or charges a node of the stabilization unit continuously to keep a voltage equal to VSS or VDD, so as to maintain the luminance intensity of the OLED.

Abstract: Disclosed is a backlight apparatus comprising a plurality of light sources; and a control unit which drives the plurality of light sources at an identical driving frequency and which performs pulse-width modulation control for a turned-on period and a turned-off period of each of the light sources; wherein the control unit is capable of setting a duty ratio for each of the light sources and each of driving cycles; and the control unit sets the duty ratio for at least two of the light sources respectively so that a condition, in which one cycle period composed of one turned-on period and one turned-off period is N times the driving cycle, is fulfilled, and the duty ratio is 0 or 1 in at least one driving cycle of N pieces of the driving cycles for constructing the one cycle period if N is not less than 2.

Abstract: An illumination apparatus includes a light source; a sensor which has an image sensor and detects an illuminance and a presence of a human based on a captured image while setting a range overlapping a range illuminated by the light source as a visual field; an illuminance determining unit for varying a light output from the light source based on the illuminance and the presence of a human; and a dimming control unit. The illuminance determining unit obtains an illuminance of an illuminance maintaining area included in the visual field based on the captured image, and when the sensor detects no human, the illuminance determining unit reduces the light output while maintaining the illuminance of the illuminance maintaining area to be equal to or greater than a threshold that is set in advance as a lower limit illuminance, which makes it feasible for the image sensor to capture an image.

Abstract: An illumination device is provided for controlling a color temperature of light irradiated from a light source having a plurality of light-emitting elements of different light colors. A control setting module provides a control signal associated with a desired color temperature for the irradiated light. A light quantity determination circuit determines light quantities for each of the light-emitting elements based on a relationship between the control signal from the control setting module and an inverse color temperature. A plurality of driver circuits provide driver signals to the light-emitting elements corresponding to the determined light quantities. In this manner the color temperature for light irradiated from the light source coincides with the desired color temperature.

Abstract: Disclosed is a lighting control apparatus. According to one embodiment of the present invention, a lighting system control be easily configured, maintained, and repaired since additional light and block control of the lighting can be provided with ease by wireless control of the lighting through wireless communication. In addition, the present invention can control individual lamps by storing a control signal corresponding to an address for each lamp in a gateway according to a predetermined scenario.

Abstract: A method for operating an LED lighting device (L), wherein the LED lighting device comprises: at least two color channels (Ch1, Ch2, Ch3), wherein each color channel (Ch1, Ch2, Ch3) comprises at least one LED (LD1, LD2, LD3), wherein the LEDs (LD1, LD2, LD3) of a color channel (Ch1, Ch2, Ch3) each have the same color, and wherein each color channel (Ch1, Ch2, Ch3) is able to be activated separately, and at least one photodetector (D), which is configured and arranged to detect a portion of the light radiated by the LEDs (LD1, LD2, LD3), wherein the method comprises the steps of: switching over the LED lighting device (L) from an operating phase (BP 1) into a measurement phase (MP); and temporally consecutive activation of the color channels (Ch1, Ch2, Ch3) so that a light radiated during the measurement phase (MP) by the LEDs (LD1, LD2, LD3) has an integral mixture which substantially corresponds to a color mixture of the operating phase.

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: The disclosure relates to an AC LED dimmer and dimming method thereof. The AC LED dimmer includes a rectifier receiving AC voltage from an AC voltage source and full-wave rectifying the AC voltage; a direct current (DC)/DC converter receiving the full-wave rectified voltage from the rectifier, generating a full-wave rectified stepped-up voltage, and generating a pulse enable signal; a pulse width modulation controller receiving the full-wave rectified stepped-up voltage and generating a pulse width modulation signal to dim an AC LED in response to the pulse enable signal; a switch driving the AC LED under control of the pulse width modulation signal, and an electromagnetic interference (EMI) filter to be connected between the AC voltage source and the switch to eliminate electromagnetic interference from the AC voltage source. Accordingly, the dimmer can perform an efficient and linear dimming function and suppress harmonics.

Abstract: An LED-based light tube for use in a conventional fluorescent fixture can feature a housing including a light transmitting portion. At least one electrical connector can be attached to the housing and configured for engagement with the conventional fluorescent fixture. At least one LED can be arranged to produce light in a direction toward the light transmitting portion. A sensor can be operable to detect a brightness level and output a corresponding signal. A controller can be in electrical communication with the at least one electrical connector and operable to control the at least one LED in response to the signal.

Abstract: A direction controllable lighting unit (10) and use thereof in a lighting system (40) are described. A lighting unit (10) has means (16) for directing the light emission (22) into different directions. A plurality of light sources (20a, 20b) are mounted on a common body (14). The light sources (20a, 20b) are disposed to emit directed light into different directions. The light is modulated to contain identification codes ‘A’, ‘B’, which are unique. Within the lighting system (40), an optical sensor (46) is arranged in a region illuminated by the lighting unit (10). The optical sensor (46) demodulates the received light according to the identification code. A control unit (44) is connected to the optical sensor (46) and to the lighting unit (10) to control the direction of the lighting unit (10) based on information from the optical sensor (46).

Abstract: To provide a small light source unit that can be used for quantum encryption communication. Provided is a light source unit including a first reflector having a reflectance R1, a second reflector arranged opposite to the first reflector and having a reflectance R2 (R2<R1), a laser medium arranged between the first reflector and the second reflector, and an excitation source to excite the laser medium, wherein the reflectance R1 is set in such a way that the number of photons of laser light having passed through the first reflector is one per pulse.

Abstract: Interactive lighting control system (and method) for controlling and creating of light effects such as the tuning of light scenes based on location indication received from an input device. A basic idea of the claimed system is to provide an interactive lighting control by combining a location indication with a light effect driven approach in lighting control in order to improve the creating of light effects such as the tuning of light scenes especially with large and diverse lighting infrastructures.

Abstract: A multi-beam light source device includes a vertical cavity surface emitting laser device having monolithically fabricated multiple light sources; an optical sensor to monitor an output of beams of light emitted from the vertical cavity surface emitting laser; a printed circuit board on which a driving circuit is formed to drive the vertical cavity surface emitting laser device based on monitoring signals from the optical sensor; a coupling lens to change the beams of light emitted from the vertical cavity surface emitting laser device to a predetermined state; a transparent board on which a wiring pattern is formed to wire an electrode of the vertical cavity surface emitting laser device and a terminal of the driving circuit; and a holding unit to integrally hold the vertical cavity surface emitting laser device, the optical sensor, the printed circuit board, the coupling device, and the transparent board.

Abstract: A light source drive device includes a first current source which provides a predetermined current to a light source corresponding to a predetermined light output, and a second current source which provides an overshoot current to the light source synchronized with the predetermined current. A processor is configured to set an overshoot time during which the overshoot current is provided to the light source. Further, an overshoot current is set which is applied to the light source. The overshoot time is set so that the overshoot time based on the rising of the predetermined current to when a light emission of the light source is detected.

Abstract: The present invention relates to color generation in an indoor or outdoor lighting device, and more particularly to a control method which provides spatially consistent color control of a lighting device designed for use in, e.g., spatially extended premises or environments containing obstacles, and thus including multiple light sensors to allow efficient control. Color consistency is achieved by an arrangement where light of one or more of the light sources impinges on more than one light sensor. If constructional detector features, such as filter characteristics, coincide, then these sensors should in principle, after the appropriate processing, report identical color points of the light source under consideration. Indeed, color is a path-independent property of light, and this is the basis for a mutual calibration scheme of the detectors according to the invention.

Abstract: A lighting tool for setting lighting parameters of a plurality of light sources (1). A processor (2) is provided which is connectable to the plurality of light sources (1), and arranged to control lighting parameters of each of the plurality of light sources (1). A position storage unit (3) is connected to the processor (2) for storing spatial positions of the plurality of light sources (1). A camera arrangement (4) is connected to the processor (2) for providing a view of at least part of a scene illuminated by the plurality of light sources (1). The processor (2) is arranged to correlate a viewing area of the camera arrangement (4) and a retrieved spatial position of one or more of the plurality of light sources (1).

Abstract: A system drives one or a plurality of LEDs, regulating their brightness by controlling the LEDs' average current or voltage. The system includes a switching power converter and an integrated digital regulator with at least one of electrical, thermal, and optical feedbacks. The regulator is constructed as a hysteretic peak current mode controller for continuous mode of operation of the power converter. For a discontinuous mode of operation of the power converter, a pulse averaging sliding mode control is used. Average LED current is measured by integrating LED pulse current at off time and hysteretically adjusting on time of the power switch. An input battery is protected from discharging at abnormally low impedance of the output.

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: A zero-heat-flux, deep tissue temperature measurement system measures internal body temperature by way of a probe having a heater and thermal sensors arranged in a zero-heat-flux construction. The measurement system includes control mechanization that determines heater and skin temperatures based upon data obtained from the probe and uses those temperatures to calculate a deep tissue temperature. The measurement system includes a signal interface cable having a connector where a probe can be releasably connected to the system. The cable and attached connector are a removable and replaceable part of the system, separate from the probe. The measurement system provides an output signal imitating a standard input signal configuration used by other equipment.

Abstract: The present disclosure is directed to a solution providing active thermal management that has multiple innovations and advantages. In some aspects, the design of the active thermal management (ATM) device is not a threshold clamp and instead, is a non-linear equation that proportionally changes relative to the dimming input. In some aspects, the innovation of the ATM design is how ATM works while the light is being dimmed. The design anticipates overheating by reducing power before the product gets to the maximum temperature threshold. The design also may include an equation that predicts the LED die temperature as a function of product case temperature.

Abstract: An apparatus for exposing photovoltaic (PV) modules to simulated sunlight for testing purposes, comprising a chamber including a plurality of lamps disposed on a substantially vertical lamp plane, at least one substantially vertical target plane upon which are disposed one or more PV modules, at least one reflector for directing light from the lamps to the at least one target plane, and a cooling system to exhaust heat from the apparatus and maintain the temperature of the PV modules at a predetermined value.

Abstract: A luminaire is providing, having a substrate of a particular shape and a plurality of solid state light sources mounted thereon. The plurality has a measurable characteristic and includes an adjustable solid state light source, such that the characteristic changes in response to adjustment thereof. The luminaire also includes a sensor that detects the characteristic from outputted light, compares it to a baseline value and, based on the comparison, so adjusts the adjustable solid state light source. The luminaire also includes a reflector with a lower edge that conforms to the particular shape of the substrate, and reflects outputted light from the plurality so that it exits past the reflector's upper edge. The luminaire also includes a lightguide having an input that is surrounded by the reflector and captures a portion of the outputted light so as to provide the captured outputted light to the sensor.

Abstract: A lighting system includes a first and a second controllable light sources generating, respectively, a first and a second lights; a first detector configured to receive at least a portion of the first light and measure at least one attribute thereof in a first predetermined location proximate to the first controllable light source; a memory configured to store at least one of a specification of the second controllable light source and at least one operating parameter of the first controllable light source. The system also includes a processor configured to receive the at least one attribute of the first light, and to control the second controllable light source to generate the second light having an attribute that substantially matches the attribute of the first light in a predetermined second location.

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 stable light source device is provided with a light source, a pinhole constricting optical flux emitted from the light source, a first integrating element inside which optical flux from the pinhole is multiply reflected, a light detection sensor monitoring a light amount, a control section controlling the light source on the basis of the light amount monitored by the light detection sensor and making the light amount consistent, an aperture formed in the first integrating element and emitting light outside the first integrating element, a diffusion-transmission member disposed at a light emission side of the aperture, a branching section disposed at a light emission side of the diffusion-transmission member and branching incident light towards plural light emission portions, and neutral density filters provided at the light emission portions, transmitted light amounts thereof respectively differing such that light amounts at the light emission portions are respectively different.

Abstract: A controller for a lighting arrangement (14) is provided, comprising a detector unit (12) having a field of view (20) and a pointing direction (21). The controller furthermore comprises an interface unit (11) for interfacing with the lighting arrangement (14), and a processing unit (10) connected to the detector unit (12) and the interface unit (11). The detector unit (12) is arranged to provide detection data comprising parameters related to one or more identifiable beacons (2) within the field of view (20) of the detector unit (12). The processing unit (10) is arranged to associate the detection data with a set of lighting parameters for the lighting arrangement (14) and to control the lighting arrangement (14) via the interface unit (11) in accordance with the set of lighting parameters. Also a method of controlling alighting arrangement is provided.

Abstract: An LED lighting module comprising: a printed circuit board (12), at least one LED (14) connected to said printed circuit board (12), a supply circuit (16) mounted on said printed circuit board (12), a protective casing (20), made of plastic, applied to said printed circuit board (12), wherein the protective casing (20) defines a light-emitting region (28) which surrounds said at least one LED (14) and a containment region (30) in which the components of said supply circuit (16) are enclosed, and a light sensor (34) arranged to receive the light emitted by said at least one LED (14) and connected to said supply circuit (16) in which said light sensor (34) is co-molded into said protective casing (20) and faces said light-emitting region (28).

Abstract: A lighting system includes a lighting panel having a string of solid state lighting devices and a current supply circuit having a voltage input terminal, a control input terminal, and first and second output terminals coupled to the string of solid state lighting devices. The current supply circuit is configured to supply an on-state drive current to the string of solid state lighting devices in response to a control signal. The current supply circuit includes a charging inductor coupled to the voltage input terminal and an output capacitor coupled to the first output terminal. The current supply circuit is configured to operate in continuous conduction mode in which current continuously flows through the charging inductor while the on-state drive current is supplied to the string of solid state light emitting devices.

Abstract: An illuminating device includes: a calibrating output unit for reading an output current command value corresponding to a specific brightness command value and for outputting the output current command value to a light source; a ratio calculating unit for calculating a ratio between an illuminance of illuminating light emitted from the light source and a prescribed illuminance value prescribed for the specific brightness command value; an illuminance calculating unit for calculating each illuminance when each output current command value matched with each brightness command value is outputted; and a calibrating unit for calibrating a relationship between each brightness command value and each output current command value in a conversion table such that each illuminance at the time when each output current command value matched with each brightness command value is outputted is set to each prescribed illuminance value prescribed for each of the brightness command values.

Abstract: A lighting device, comprising first and second light emitters that emit light having first and second color points, respectively, and first and second sensors that detect brightness of light within 0.01 delta u?, v? of the first and second color points, respectively. A method comprising supplying energy to first and second light, emitters that emit light having first and second color points, respectively, and detecting brightness of light within 0.01 delta u?, v? of the first and second color points, respectively.

Abstract: A lighting controlling apparatus including: a management server generating control information based on information received from a user; a digital addressable lighting interface (DALI) master that is connected to the management server via wired or wireless communication and generates a control message based on the control information; and a DALI ballast that is connected to the DALI master via DALI communication and drives a lighting apparatus by using the control message. Accordingly, a plurality of DALI masters may be locally or remotely controlled via the management server. Also, not only the DALI ballast may be controlled by using the DALI master via DALI communication but also, it may be selectively controlled in regard to the relationship between a DALI switch. In addition, the DALI ballast may be directly controlled by using a sensor and a remote controller.

Abstract: A switching power source for driving a light emitting element, a pulse-drive switching element connected in parallel to the light emitting element, a photodetector for detecting an intensity of an output light output from the light emitting element, a current detecting element for detecting a current flowing from the switching power source, and an operation processing unit that controls an operation of the switching power source by performing a feedback loop operation based on a detection result from the photodetector and a feedback loop operation based on a detection result from the current detecting element are provided to stabilize an emission waveform even when the light emitting element is subjected to a pulsed emission.

Abstract: A backlight apparatus comprises a light emission control unit which controls light emission of each of a plurality of light source blocks; a luminance detecting unit which detects a luminance of the light source block; and a correcting unit which successively executes a correcting process for the plurality of light source blocks by allowing one light source block to emit light so that a light emission amount of the concerning light source block is corrected on the basis of a detected luminance value and a target value thereof; wherein a temperature fluctuation suppressing process is executed when the correcting unit executes the correcting process, so that a plurality of the light source blocks, which include the light source block assumed to emit light in the correcting process to be executed next time, are simultaneously allowed to emit light for a predetermined period at a predetermined luminance.

Abstract: A lighting apparatus includes an illuminance sensor, a dimming control device and a light source. The lighting apparatus calculates a light output characteristic of the light source based on an illuminance measurement value when the light source is turned off and an illuminance measurement value when the light source is lit with a predetermined output, and calculates an ambient illuminance based on the light output characteristic. The illuminance measurement by the illuminance sensor is performed every predetermined period, and dimming control is performed on the light source based on the calculated ambient illuminance.

Abstract: Commissioning a coded light source in a lighting system is accomplished by using a remote controller. When an identification of a light source is successful, a control message is sent to that light source to at least partly switch off its light emission. Thus the light contribution of the identified light source is suppressed. Thereby the chance of coded light from an already identified light source colliding with identifiers comprised in coded light emitted by other light sources is reduced. When no more coded light is detectable, a sensitivity of the remote controller can be increased until coded light again is detectable. Further light sources can then be identified and commissioned.

Abstract: A portable electronic device and a light flickering method for light emitting elements thereof are both disclosed herein. The portable electronic device includes at least one light emitting element. The light flickering method comprises the following steps: setting personalized light flickering data with a user interface; storing the personalized light flickering data; generating a control signal in accordance with the personalized light flickering data; and generating a driving signal in accordance with the control signal and driving the light emitting elements with the driving signal.

Abstract: A lighting system comprises a plurality of lighting units (1, 4) each configured to light a target area. A central dimming element having an adjustable conductance is provided. Each lighting unit comprises at least one light source (101, 201), a controllable light source driver (2, 5) coupled to the light source (101, 201), and a light sensor (3, 6) configured to measure a light flux in the target area of the lighting unit (1, 4). The light source driver supplies power to the light source in accordance with an input control voltage generated by a current source. The light sensor is coupled to the current source, and has a variable conductance corresponding to the light flux. The lighting units (1, 4) can be dimmed in combination by coupling each light sensor (3, 6) in parallel to the dimming element (7) through a respective diode (9, 10, 13).

Abstract: A lighting device comprises groups of solid state light emitters, a sensor and circuitry. If the emitters are illuminated, the sensor is exposed to combined light from the groups, and senses only a portion of the combined light. The circuitry adjusts current applied to at least one of the emitters based on an intensity of the light sensed. Also, a device comprising emitters, a circuit board and a sensor, at least one of the emitters being positioned on the first circuit board and the sensor being spaced from the circuit board. Also, a lighting device comprising emitters, a sensor, and circuitry which adjusts current applied an emitters based on detection by the first sensor, the circuitry comprising a differential amplifier circuit. Also, a lighting device, comprising light emitters and circuitry which adjusts current applied to only some of the emitters based on ambient temperature. Also. methods of lighting.

Abstract: A system and method for metered dosage illumination in a bioanalysis or other system. In accordance with an embodiment, an illumination system or subsystem is described that can provide optimized amounts of excitation light within the short exposure times necessary to measure fast biological activity. The amount of light can be precisely measured to provide quantitative results. The light flux can also be precisely controlled to generate only a prescribed minimum amount of light, in order to reduce adverse lighting effects on both fluors and samples. Although the examples herein illustrate the providing of metered dosage illumination in the context of a bioanalysis system, the techniques can be similarly used to provide metered dosage illumination in the context of other types of system.

Abstract: A system and method for metered dosage illumination in a bioanalysis or other system includes an illumination system or subsystem that can provide optimized amounts of excitation light within the short exposure times necessary to measure fast biological activity. The amount of light can be precisely measured to provide quantitative results. The light flux can be precisely controlled to generate a prescribed minimum amount of light, in order to reduce adverse lighting effects on both fluors and samples. The system and method is particularly useful in any quality-control, analysis, or assessment-based environment. Typical research and development applications can include quality control, instrument calibration, and light output standardization; while clinical and diagnostics applications can include clinical monitoring, bioassay calibration and control for diagnostics, treatment and or therapeutic evaluation.

Abstract: This invention relates to a method and system for controlling light distribution in a space including multiple installed light sources and an external light source. The luminance level of light from said light sources is measured at different measuring areas within the space. A weighed luminance level is determined for each of the measuring areas based on the measured luminance levels, where the weighted luminance level indicates the contribution from the light sources to the measured luminance level at the different measuring areas. This weighed luminance level is used as a tuning parameter for tuning the emitted light at the installed light sources such that the weighed luminance level at each of the different measuring areas substantially matches a pre-defined target luminance level at the different measuring areas.

Abstract: An occupancy sensor is provided with a separable override unit to selectively override the operation of the occupancy sensor at designated times and for selected time intervals. The occupancy sensor includes a light sensor for actuating the occupancy sensor and a light assembly when the ambient light is below a predetermined level and to deactivate the occupancy sensor when the ambient light is above a threshold level. The override unit having a light source is removably attached to the occupancy sensor. The override unit is coupled to the occupancy sensor to emit light to actuate the light sensor of the occupancy sensor, thereby preventing the occupancy sensor from being actuated regardless of the light level in the surrounding areas. A control unit is operatively connected to one or more override units for selectively controlling the normal operation of the occupancy sensor.

Abstract: The present invention relates to a method for color control of a lighting system (10) comprising a first (1) and a second (2) light source configured to emit light of different primary colors. By means of the invention, it is possible to determine a color point (cp3) for mixed light emitted by the first (1) and the second (2) light sources having a minimal difference in perceived color output as compared to a target color point (cpr).

Abstract: An illumination apparatus that includes a plurality of LEDs of different center emission wavelengths, a photodetector, a path sharing device for introducing light emitted from the plurality of LEDs into the common optical path, a light-introducing device located on the common optical path to introduce part of the light emitted from the plurality of LEDs passing through the common optical path into the photodetector, a feedback controller controlling turning-on states of the LEDs over preset states in accordance with the amount of light emitted from the plurality of LEDs detected by the photodetector, and an illumination light supplying device located on the common optical path to supply light which is emitted from the plurality of LEDs to pass through the common optical path and is not introduced into the photodetector through the light-introducing device, as illumination light for a cellular analysis.

Abstract: A lighting system for areal illumination is disclosed which includes a remote driver and a plurality of fixtures including luminaires, control devices, and/or standalone sensors. The luminaires include a light source whose output light level can be adjusted, a light sensor co-located therewith adapted to measure light received from adjacent fixtures, and a microcontroller capable of transmitting the output of the light sensor over wires to the remote driver. The remote driver is capable of bidirectional communication with the luminaires and provides independently controllable power for the light sources of the luminaires. A movable orb region containing luminaires can also be defined and the light levels of individual luminaires can be set according to their location within the orb region.

Abstract: Coded light has been proposed to enable advanced control of light sources and transmit information using light sources. Methods, devices and systems configured to operate a coded lighting control system, which is robust to interference from other sources of light are proposed. The method is based on sensing the light by a remote control device, and based on the sensing result adapting the identifiers used by the different light sources. By assigning a code identifier to the light source based on light received by the light receiver the code identifiers may be selected such that the influence of light interfering with the light source identifiers may be mitigated.