Abstract: A Light Emitting Diode, LED, based lighting device arranged for emitting a particular color of light, wherein said LED based lighting device comprises a power supply unit arranged for providing a Direct Current, DC, bus voltage for powering LEDs, a plurality of parallel cascaded LED channels, wherein each of said LED channels is connected to said bus voltage and comprises at least one colored LED and a switch for activating said corresponding LED channel, a controller arranged for providing control signals to each of said switches in said LED channels for periodically activating said LED channels, wherein each of said control signals has a duty cycle, and wherein said controller is arranged for determining said duty cycles of said control signals based on a received color set point, wherein said controller is further arranged for determining an amount of deficiency in light output of each of said LED channels caused by parasitic effects in said LED based lighting device, by determining instantaneous currents

Abstract: A method (500) of configuring a light source array (110) of a system is disclosed. The system further comprising a display (110) and a camera (108), wherein the light source array (110) comprises a plurality of individually controllable lighting units, and wherein the light source array (110) has been positioned relative to the display (110).

Abstract: A Light Emitting Diode, LED, based lighting device arranged for emitting a particular color of light, wherein said LED based lighting device comprises a power supply unit arranged for providing a Direct Current, DC, bus voltage for powering LEDs, a plurality of parallel cascaded LED channels, wherein each of said LED channels is connected to said bus voltage and comprises at least one colored LED and a switch for activating said corresponding LED channel, a controller arranged for providing control signals to each of said switches in said LED channels for periodically activating said LED channels, wherein each of said control signals has a duty cycle, and wherein said controller is arranged for determining said duty cycles of said control signals based on a received color set point, wherein said controller is further arranged for determining an amount of deficiency in light output of each of said LED channels caused by parasitic effects in said LED based lighting device, by determining instantaneous currents

Abstract: A monitor device is provided for monitoring a lighting arrangement of lighting elements of unknown electrical load, and a driver using the monitoring arrangement. A set of duty cycles is applied to switches which control sub-sets of lighting elements thereby to create a desired light output. With this desired duty cycle setting, the current for an individual duty cycle period is monitored, in particular to detect variations in a current plateau level within the individual duty cycle period. This is used to determine electrical characteristics or parameters including at least a cable resistance between a power supply unit and the lighting arrangement. A power consumption of the lighting arrangement may then be obtained. This avoids the need to probe the sub-sets of lighting elements individually in order to determine the nature of the load and its power consumption.

Abstract: The present invention provides a light emitting diode(s), LED, light strip arranged for providing improved color consistency over its length. The LED light strip comprises LED strings positioned along the length of the LED light strip and powered in parallel, for emitting, for example, red, green, blue and white light. The resistance of the supply and return traces, in combination with variations in the current drawn by or the forward voltage of the various LED and resistors used in the LED strings of different color, causes a voltage drop along these traces leading to inconsistent color rendering. By adjusting the resistivity of the traces, such as through providing return paths having different resistances for LED strings of different color, the consistency of the color rendering can be improved.

Abstract: A monitor device is provided for monitoring a lighting arrangement of lighting elements of unknown electrical load, and a driver using the monitoring arrangement. A set of duty cycles is applied to switches which control sub-sets of lighting elements thereby to create a desired light output. With this desired duty cycle setting, the current for an individual duty cycle period is monitored, in particular to detect variations in a current plateau level within the individual duty cycle period. This is used to determine electrical characteristics or parameters including at least a cable resistance between a power supply unit and the lighting arrangement. A power consumption of the lighting arrangement may then be obtained. This avoids the need to probe the sub-sets of lighting elements individually in order to determine the nature of the load and its power consumption.

Abstract: A monitor device is provided for monitoring a lighting arrangement of lighting elements of unknown electrical load, and a driver using the monitoring arrangement. A set of duty cycles is applied to switches which control sub-sets of lighting elements thereby to create a desired light output. With this desired duty cycle setting, the current for an individual duty cycle period is monitored, in particular to detect variations in a current plateau level 5 within the individual duty cycle period. This is used to determine a power consumption of the lighting arrangement and to adjust the duty cycles as a function of the detected current. This avoids the need to probe the sub-sets of lighting elements individually in order to determine the nature of the load and its power consumption.

Abstract: A monitor device is provided for monitoring a lighting arrangement of lighting elements of unknown electrical load, and a driver using the monitoring arrangement. A set of duty cycles is applied to switches which control sub-sets of lighting elements thereby to create a desired light output. With this desired duty cycle setting, the current for an individual duty cycle period is monitored, in particular to detect variations in a current plateau level 5 within the individual duty cycle period. This is used to determine a power consumption of the lighting arrangement and to adjust the duty cycles as a function of the detected current. This avoids the need to probe the sub-sets of lighting elements individually in order to determine the nature of the load and its power consumption.

Abstract: A lighting assembly (100), an LED strip, a luminaire and a method of manufacturing a lighting assembly are provided. The lighting assembly (100) is for emitting substantially white light of a controllable correlated color temperature and comprises groups of a first light source (110), a second light source (120), a third light source (130) and a controller (140). The first light source is for emitting substantially white light having a color temperature larger than 5000 Kelvin. The second light source is for emitting substantially white light having a color temperature smaller than 2250 Kelvin. The third light source is for emitting greenish light. The greenish light has a third color point in the CIE 1931 XYZ color space within an intersection of half spaces y>=1.04 x and y>=?0.0694x+0.4525. The controller is for controlling the light emission of said light sources.

Abstract: Determination devices (1) determine properties of load devices (2) that may remain unchanged for said determining and that comprise first channels with first elements (20, 25). The determination devices comprise first switches (10) for providing first invitation signals to the first channels, detectors (15, 16) for detecting first response signals that result from the first invitation signals, and controllers (17) for deriving the properties of the load devices (2) from detections of the first response signals. The properties define first maximum values of first loads of the first channels, and the controllers (17) calculate first maximum duty cycles of first supply signals for supplying the first channels in view of the first maximum values of the first loads and power capacities of power supplies (3) that produce the first supply signals. The load devices (2) may further comprise second channels with second elements (21, 26), and the determination devices (1) may further comprise second switches (11).

Abstract: A lighting device (10) is disclosed comprising a flexible arrangement including a chain of strips (11) wherein respective end portions of neighboring strips (11) are interconnected by a hinging joint (13) and a plurality of LEDs (15) positioned at regular intervals along the flexible arrangement. The pitch of the LEDs (15) in such a lighting device (10) may be adjusted by adjusting the angle between neighboring strips (11) interconnected by a hinging joint (13). A lighting system (100) comprising such lighting devices (10) and a central controller (110) is also disclosed.

Abstract: A lighting device (10) is disclosed comprising a flexible arrangement including a chain of strips (11) wherein respective end portions of neighboring strips (11) are interconnected by a hinging joint (13) and a plurality of LEDs (15) positioned at regular intervals along the flexible arrangement. The pitch of the LEDs (15) in such a lighting device (10) may be adjusted by adjusting the angle between neighbouring strips (11) interconnected by a hinging joint (13). A lighting system (100) comprising such lighting devices (10) and a central controller (110) is also disclosed.

Abstract: A lighting assembly (100), a LED strip, a luminaire and a method of manufacturing a lighting assembly are provided. The lighting assembly (100) is for emitting substantially white light of a controllable correlated color temperature and comprises groups of a first light source (110), a second light source (120), a third light source (130) and a controller (140). The first light source is for emitting substantially white light having a color temperature larger than 5000 Kelvin. The second light source is for emitting substantially white light having a color temperature smaller than 2250 Kelvin. The third light source is for emitting greenish light. The greenish light has a third color point in the CIE 1931 XYZ color space within an intersection of half spaces y>=1.04 x and y>=?0.0694x+0.4525. The controller is for controlling the light emission of said light sources.

Abstract: Determination devices (1) determine properties of load devices (2) that may remain unchanged for said determining and that comprise first channels with first elements (20, 25). The determination devices comprise first switches (10) for providing first invitation signals to the first channels, detectors (15, 16) for detecting first response signals that result from the first invitation signals, and controllers (17) for deriving the properties of the load devices (2) from detections of the first response signals. The properties define first maximum values of first loads of the first channels, and the controllers (17) calculate first maximum duty cycles of first supply signals for supplying the first channels in view of the first maximum values of the first loads and power capacities of power supplies (3) that produce the first supply signals. The load devices (2) may further comprise second channels with second elements (21, 26), and the determination devices (1) may further comprise second switches (11).

Abstract: The present invention provides a light emitting diode(s), LED, light strip arranged for providing improved color consistency over its length. The LED light strip comprises LED strings positioned along the length of the LED light strip and powered in parallel, for emitting, for example, red, green, blue and white light. The resistance of the supply and return traces, in combination with variations in the current drawn by or the forward voltage of the various LED and resistors used in the LED strings of different color, causes a voltage drop along these traces leading to inconsistent color rendering. By adjusting the resistivity of the traces, such as through providing return paths having different resistances for LED strings of different color, the consistency of the color rendering can be improved.

Abstract: The invention provides a luminaire (100) comprising an array (102) of light exit windows (104, 104?, 104?, 204, 304?, 304?, 404?, 404?, 604, 804?, 804?, 804??, 904?, 904?, 1004, 1004?, 1004?), wherein each light exit window comprises a material adjustable between at least a first state having a first translucence and a second state having a second translucence and an electrode arrangement (112) for adjusting said translucence of the material. Such a luminaire (100) can provide differing lighting effects whilst providing illumination and, additionally, differing aesthetic effects when viewed under ambient lighting. There is also provided a method of configuring the luminaire (1100), a computer program product for implementing the method (1200), a computing device including the computer program product (1300) and a lighting system comprising the luminaire (100).

Abstract: A solid state light emitter package (200), a light emitting device, a flexible LED strip and a luminaire are provided. The solid state light emitter package comprising: i) at least three solid state light emitter dies (132, 142, 152) which emit violet/blue light, red light and further light, respectively, ii) a luminescent converter (120) with luminescent material, iii) an optical element (102, 105) for mixing at least portion of the light of the different colors of light and iv) a light exit window (114). The luminescent material at least partially converts the further light towards greenish light having a peak wavelength in the green or cyan spectral range and has a color emission distribution that is wide enough such that the solid state light emitter package is capable of emitting light with a high enough Color Rendering Index. The Color Rendering Index relates to light that has a color point close to the black body line.

Abstract: A solid state light emitter package (200), a light emitting device, a flexible LED strip and a luminaire are provided. The solid state light emitter package comprising: i) at least three solid state light emitter dies (132, 142, 152) which emit violet/blue light, red light and further light, respectively, ii) a luminescent converter (120) with luminescent material, iii) an optical element (102, 105) for mixing at least portion of the light of the different colors of light and iv) a light exit window (114). The luminescent material at least partially converts the further light towards greenish light having a peak wavelength in the green or cyan spectral range and has a color emission distribution that is wide enough such that the solid state light emitter package is capable of emitting light with a high enough Color Rendering Index. The Color Rendering Index relates to light that has a color point close to the black body line.

Abstract: The present invention relates to a lighting device (1). The lighting device comprises a light source (7) arranged at a base (2) of the lighting device, the light source having a main forward emission direction (12). The lighting device further comprises a radio frequency, RF, antenna (10) configured to receive signals for controlling the lighting device and a reflector (9) arranged to reflect light from the light source laterally and backwardly. The RF antenna is arranged at the reflector. The present invention is advantageous in that the RF reception of the lighting device is improved.

Abstract: A lighting device (2) comprises a light source (210) having a main forward emission direction (20), and an envelope (220) in which the light source (210) is arranged. The envelope (220) comprises an upper portion (225) having scattering properties and being arranged to reflect a part of the light from the light source (210) laterally and backwardly relative to the main forward emission direction (20) and transmit a part of the light from the light source (210). The light intensity distribution of the lighting device (2) is more uniform, as backward and lateral light intensity is increased while the light in the main forward emission direction (20) is still admitted.