Abstract: A method of controlling a multicolor LED lighting device is discloses. The LED lighting device comprises at least two series-connected LED light sources with different color metric values and supplied with a current, each LED light source is controlled by a respective switch operating according to a duty cycle. The method adapts an operating current amplitude supplied to the multicolor LED lighting device based on a color point that is required by a user. The method comprises the steps of receiving a designated color metric value for the LED lighting device; determining an operating current amplitude for the LED lighting device based on a current profile over a range of color metric values and the designated color metric value, and setting the current supplied to the LED light sources to the determined operating current amplitude.

Abstract: A method is provided for controlling a multi-channel lighting system in which (nominal) color point information in respect of the light sources is adjusted both in dependence on a temperature estimate and on the current drive levels needed. The method thus compensates separately for the light source temperature and the effect that the calculated current drive levels have on the color point and flux. An iterative loop finds the current drive levels to achieve a desired color point and flux.

Abstract: The invention relates to a lighting unit comprising a power converter for providing a regulated power to a first LED load where the first LED load comprises at least one LED, wherein the first LED load is coupled to the power converter, a series combination of a first capacitor and a first switch coupled in series with each other, wherein the series combination is coupled in parallel with the LED load, wherein the power converter is arranged to operate in a first mode, provide a first amount of the regulated power to the first LED load, and wherein the first switch is closed, and in a second mode, provide a second amount of the regulated power to the first LED load, wherein the second amount of the regulated power to the first LED load is lower than the first amount of the regulated power to the first LED load, and wherein the first switch is opened.

Abstract: A lighting circuit has a series connection of a plurality of lighting channels of different output colors, driven by a current source. Some or all of the lighting channels comprise a LED arrangement, a shunt switch in parallel with the LED arrangement and a current leakage path in parallel with the LED arrangement. The current leakage path is used to calibrate the current flowing through the LED arrangement and thereby take account of the LED characteristics.

Abstract: The invention relates to an electronic device (1) for determining a reachability of a further electronic device (15-18) over a wireless connection. The further electronic device is part of a wireless network. The electronic device is configured to determine whether the further electronic device is reachable using a first wireless communication protocol (31), determine whether the further electronic device is reachable using a second wireless 5 communication protocol (33), and provide an indication of a status of the further electronic device based on the reachability of the further electronic device using the first wireless communication protocol and the reachability of the further electronic device using the second wireless communication protocol.

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 of controlling a multicolor LED lighting device is discloses. The LED lighting device comprises at least two series-connected LED light sources with different color metric values and supplied with a current, each LED light source is controlled by a respective switch operating according to a duty cycle. The method adapts an operating current amplitude supplied to the multicolor LED lighting device based on a color point that is required by a user. The method comprises the steps of receiving a designated color metric value for the LED lighting device; determining an operating current amplitude for the LED lighting device based on a current profile over a range of color metric values and the designated color metric value, and setting the current supplied to the LED light sources to the determined operating current amplitude.

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: The present invention relates to a color tunable filament lamp (10), comprising: at least one tunable white LED filament (12) adapted to emit white light; and at least one RGB LED filament (22), wherein each RGB LED filament of the at least one RGB LED filament comprises a plurality of groups (26), each group comprising a red LED (28a), a green LED (28b) and a blue LED (28c), wherein each tunable white LED filament of the at least one tunable white LED filament comprises first LEDs (16?) having a first pre-set correlated color temperature and second LEDs (16?) having a second pre-set correlated color temperature lower than the first pre-set correlated color temperature, the first and second pre-set correlated color temperatures defining a sub-range (40?) of a correlated color temperature range (40) of the color tunable filament lamp, and wherein the color tunable filament lamp is configured to use the first LEDs and the second LEDs but not the at least one RGB LED filament for target points (38) in said sub-r

Abstract: The invention relates to a lighting device which is operable in two modes. In a first operating mode the flux of a lighting effect having a specified chromaticity is rendered based on the maximum (luminous) flux at which the chromaticity can be rendered by the lighting device. This can cause the maximum (luminous) flux across a range of colors that the lighting device can render to vary greatly. For example, a white color may be rendered at a far greater intensity than a primary color. In a second operating mode the specified chromaticity is rendered based on a predetermined maximum (luminous) flux for that specified chromaticity, or a color range that it is comprised in, or a predetermined maximum (luminous) flux for one or more color channels that are used in combination to render the light effect. This reduces the differences in maximum (luminous) flux of lighting effects rendered across the range of colors that are rendered by the lighting device.

Abstract: The invention provides a lighting device (1000) comprising a multi-layer PCB stack (100) comprising n stacked layers (110), wherein n?2, wherein k layers (110) of the n stacked layers (110) each comprises a PCB (200) with a solid state light source (10), wherein 2?k?n, wherein the solid state light sources (10) are configured to generate light source light (11), wherein the layers (110) are shaped and stacked such that the light source light (11) of a 5 light source (10) of any of the PCBs (200) is at least partly not physically blocked by any of the other PCBs (200).

Abstract: The invention relates to an electronic device (1) for determining a reachability of a further electronic device (15-18) over a wireless connection. The further electronic device is part of a wireless network. The electronic device is configured to determine whether the further electronic device is reachable using a first wireless communication protocol (31), determine whether the further electronic device is reachable using a second wireless 5 communication protocol (33), and provide an indication of a status of the further electronic device based on the reachability of the further electronic device using the first wireless communication protocol and the reachability of the further electronic device using the second wireless communication protocol.

Abstract: The present invention relates to a color tunable filament lamp (10), comprising: at least one tunable white LED filament (12) adapted to emit white light; and at least one RGB LED filament (22), wherein each RGB LED filament of the at least one RGB LED filament comprises a plurality of groups (26), each group comprising a red LED (28a), a green LED (28b) and a blue LED (28c), wherein each tunable white LED filament of the at least one tunable white LED filament comprises first LEDs (16?) having a first pre-set correlated color temperature and second LEDs (16?) having a second pre-set correlated color temperature lower than the first pre-set correlated color temperature, the first and second pre-set correlated color temperatures defining a sub-range (40) of a correlated color temperature range (40) of the color tunable filament lamp, and wherein the color tunable filament lamp is configured to use the first LEDs and the second LEDs but not the at least one RGB LED filament for target points (38) in said sub-ra

Abstract: The invention relates to a lighting device which is operable in two modes. In a first operating mode the flux of a lighting In effect having a specified chromaticity is rendered based on the maximum (luminous) flux at which the chromaticity can be rendered by the lighting device. This can cause the maximum (luminous) flux across a range of colors that the lighting device can render to vary greatly. For example, a white color may be rendered at a far greater intensity than a primary color. In a second operating mode the specified chromaticity is rendered based on a predetermined maximum (luminous) flux for that specified chromaticity, or a color range that it is comprised in, or a predetermined maximum (luminous) flux for one or more color channels that are used in combination to render the light effect. This reduces the differences in maximum (luminous) flux of lighting effects rendered across the range of colors that are rendered by the lighting device.

Abstract: A lighting circuit makes use of a switch mode power converter to drive a solid state lighting arrangement having a lighting unit and a lighting control switch. A pulse width modulation control signal is applied to the lighting control switch for dimming control with an activation pulse during which the lighting unit is activated. The power converter delivers a triangular current waveform and the activation pulse is delayed until a predetermined point within the triangular current waveform. This ensures that the PWM pulse during which the lighting arrangement is turned on has timing which is synchronized with the timing of the switch mode power converter. The prevents beat frequencies so that visible flicker is avoided.

Abstract: A lighting device (1) is disclosed, comprising a carrier substrate (4) and a heat-transferring element (5). The carrier substrate (4) includes at least a first region (6) and a second region (8). The first region (6) comprises a light-emitting module (7). The second region (8) comprises a communication module (9), which is configured for wireless communication. The heat-transferring element (5) connected with the carrier substrate (4). The carrier substrate (4) partly overlies the heat-transferring element (5) such that at least a part or portion of the first region (6) of the carrier substrate (4) overlies the heat-transferring element (5) and at least a part or portion of the second region (8) of the carrier substrate (4) does not overlie the heat-transferring element (5).

Abstract: A lighting device (1) is disclosed. The lighting device (1) comprises: a communication unit (10) for wireless communication between the lighting device (1) and an external device; a solid-state lighting element (3) electrically connected to the communication unit (10); a heat sink (5) in thermal contact with the solid-state lighting element (3), the heat sink (5) having a slot (5a) adapted to act as a slot antenna; and a feed antenna (11) electrically connected to the communication unit (10), the feed antenna (11) having at least one end tip arranged at the slot (5 a) so as to enable the feed antenna (11) and the slot (5a) to communicate by proximity coupling.

Abstract: A lighting circuit makes use of a switch mode power converter to drive a solid state lighting arrangement having a lighting unit and a lighting control switch. A pulse width modulation control signal is applied to the lighting control switch for dimming control with an activation pulse during which the lighting unit is activated. The power converter delivers a triangular current waveform and the activation pulse is delayed until a predetermined point within the triangular current waveform. This ensures that the PWM pulse during which the lighting arrangement is turned on has timing which is synchronized with the timing of the switch mode power converter. The prevents beat frequencies so that visible flicker is avoided.

Abstract: A lighting device (1) is disclosed, comprising a carrier substrate (4) and a heat-transferring element (5). The carrier substrate (4) includes at least a first region (6) and a second region (8). The first region (6) comprises a light-emitting module (7). The second region (8) comprises a communication module (9), which is configured for wireless communication. The heat-transferring element (5) connected with the carrier substrate (4). The carrier substrate (4) partly overlies the heat-transferring element (5) such that at least a part or portion of the first region (6) of the carrier substrate (4) overlies the heat-transferring element (5) and at least a part or portion of the second region (8) of the carrier substrate (4) does not overlie the heat-transferring element (5).

Abstract: A lighting device (1) is disclosed. The lighting device (1) comprises: a communication unit (10) for wireless communication between the lighting device (1) and an external device; a solid-state lighting element (3) electrically connected to the communication unit (10); a heat sink (5) in thermal contact with the solid-state lighting element (3), the heat sink (5) having a slot (5a) adapted to act as a slot antenna; and a feed antenna (11) electrically connected to the communication unit (10), the feed antenna (11) having at least one end tip arranged at the slot (5 a) so as to enable the feed antenna (11) and the slot (5a) to communicate by proximity coupling.