Abstract: A light emitting device configured to emit light with a total color temperature (CTtot), said light emitting device comprising at least one first light emitting diode (LED) filament, and at least one second LED filament, wherein each of the at least one first LED filament and the at least one second LED filament comprises an elongated carrier, and an array of light emitting diodes mounted on said substrate; and a controller for individually controlling said at least first LED filament and said at least one second LED filament, wherein said at least one first LED filament is arranged to emit light of a first color temperature (CT1), said first color temperature being controllable in a first color temperature range, from CT1low to CT1high, wherein said at least one second LED filament is arranged to emit light of a second color temperature (CT2), said second color temperature being controllable in a second color temperature range, from CT2low to CT2high, and wherein said controller is configured to control said

Abstract: Because of the line-of-sight character of optical wireless communication and a limited field-of-view of optical receivers, the coverage of an access point (120) and the overlapping coverage area of adjacent access points (120) in an optical system are smaller as compared to a RF system. It turns more challenging to support an end point (110) to roam securely in an optical multi-cell wireless communication network (100). To address that problem, a subsystem is disclosed to select for the end point (110) a candidate access point out of the plurality of access points (120) in view of one or more neighbor relationships, and to inform the end point (110) about the candidate access point to trigger the end point (110) to start a procedure for pre-establishing a new pairwise transient key between the end point (110) and the candidate access point (120) for a secure handover.

Abstract: A horticulture lighting arrangement comprises (i) a lighting system configured to provide horticulture light having a controllable spectral power distribution, and (ii) a control system configured to control the spectral power distribution of the horticulture light; wherein in an operational mode of the horticulture lighting arrangement the horticulture lighting arrangement is configured to provide the horticulture light according to an on-off schedule wherein consecutively an on-period (D) and an off-period (N) are applied.

Abstract: The present disclosure relates to a light-emitting diode, LED, filament system (770) comprising a LED filament (100) and a controller (771). The LED filament comprises a carrier (120) arranged in the shape of a spiral formed by successive loops (250). The LED filament further comprises a plurality of LEDs (110) arranged in a linear array on one side of the carrier. The LEDs are arranged along the carrier in sections (140a-f), each section having a position along the spiral-shaped carrier. The controller is configured to control a power supply to a section, or to a group of sections, of the LED filament. The controller is adapted to control a section based on its position, or a group of sections based on the positions of the sections of said group.

Abstract: A device (11) for providing audio and/or video content to a media rendering device over a physical connection and controlling one or more wireless lighting devices (31,32) to render light effects based on an analysis of the audio and/or video content is configured to obtain relative distance information (201-204). The relative distance information is indicative of distances between the device and each of a plurality of wireless lighting devices (31-34). The device is further configured to select, based on the relative distance information, the one or more wireless lighting devices from the plurality of wireless lighting devices, perform the analysis of the audio and/or video content, determine the light effects based on the analysis of the audio and/or video content, and control the selected one or more wireless lighting devices to render the light effects.

Abstract: An LED filament device is provided with a LED filament that has a plurality of sources of light. The sources of light are configured in an k*1 array with k=2 columns, and the array has a first set of at least 20 sources of light distributed over the columns. In a first column of the first set at least 90% of the total number of sources of light are selected from the group of (i) first sources of light and fifth sources of light. In a second column of the first set at least 80% of the total number of sources of light are selected from the group of second sources of light, third sources of light and fourth sources of light.

Abstract: A resonant inverter has a switch network from which a phase signal is provided representing the phase of the switching signal. A resonant tank circuit is coupled to the first switch network output and provides a feedback signal comprising a resonance voltage across a circuit element of the resonant tank circuit. A reference current to be drawn from the input node is set and a reference phase is set based on the reference current. The switching signal for the switch network is controlled based on a phase difference between the resonance voltage and the phase signal, and based on the reference phase. This resonant inverter employs a phase modulation scheme as the control scheme for the switch network of a resonant inverter. This approach is suited for high and very high frequency operation of resonant converters, for example up to tens of MHz.

Abstract: This invention relates to a safety measure taken against unsafe exposure of high-intensity laser light that is relevant for the reliable and safer operation of laser-based lighting devices. According to this invention, a lighting device comprises a first light-emitting semiconductor device and a light-conversion device. The first light-emitting semiconductor device is a laser device configured to generate a first light output and the 5light-conversion device is configured to receive the first light output and convert at least part of the first light output into a converted light output. The lighting device further comprises an optical element configured to receive the converted light output from the light-conversion device. The optical element is configured to transmit the converted light output and the first light output, and attenuate the first light output above a threshold value of the first light output.

Abstract: The invention provides a light generating device (100) comprising (i) n filaments (200), (ii) an power distribution unit (400), and (iii) electronics (500); wherein: (a) each of the n filaments (200) comprises one or more solid state light sources (10), wherein n?1, wherein each of the n filaments (200) comprises at least m electrical contacts (221), wherein m?2; and wherein the n filaments (200) are configured to generate filament light (201); (b) the power distribution unit (400) comprises k electrically conductive tracks (410) separated by electrically insulating material (420), wherein k?2; (c) at least two of the electrical contacts (221) of the n filaments (200) are functionally coupled to at least two different electrically conductive tracks (410); (d) the at least two different electrically conductive tracks (410) are functionally coupled to the electronics (500); and (e) the electronics (500) comprise one or more of a control system, a driver, and a transformer.

Abstract: The invention provides a light generating system for arthropod keeping, configured to generate system light, wherein in a first operational mode the light generating system is configured to provide the system light having a spectral power distribution, wherein the spectral power distribution comprises: a first spectral power E1 in a first wavelength range of 360-780 nm; a second spectral power E2 in a second wavelength range of 360-400 nm; a third spectral power ES in a third wavelength range of 400-480 nm; a fourth spectral power EM in a fourth wavelength range of 480-580 nm; a fifth spectral power EL in a fifth wavelength range of 580-700 nm; a sixth spectral power E6 in a sixth wavelength range of 620-700 nm; a seventh spectral power E7 in a seventh wavelength range of 700-780 nm; and wherein: 1.75?EM/ES?20; E2/E1?0.005; E7/E1?0.022; and EL/E1?0.3; or 0.3<EL/E1?0.8, and 3.4?E6/ES?14, and wherein the sixth wavelength range comprises a peak between 650-690 nm.

Abstract: A lighting strip has a printed circuit board with one or more perforated lines at which the printed circuit board length may be adjusted by breaking off an end portion of the printed circuit board. A first layer has a first set of conductive tracks and a second layer has a second set of conductive tracks corresponding to the first set of conductive tracks. Each conductive track of the second set is vertically aligned and positioned over the corresponding conductive track of the first set. An array of contact terminals is provided on a third layer. A plurality of lighting elements is disposed along the lighting strip, each electrically connected to a respective pair of the contact terminals. The lighting strip further comprises a set of vias connecting each conductive track of the first set to the corresponding conductive track of the second set.

Abstract: A driver for driving a load, wherein the driver comprises a dual-boost converter comprising an output capacitance comprising a first output capacitor connected in series with a second output capacitor, a first switch connected to a power input stage via a first inductor and arranged for controlling charging of said first output capacitor via a first diode and a second switch, connected in series with said first switch, and connected to the power input stage via a second inductor and arranged for controlling charging of said second output capacitor via a second diode; wherein a centre tap of said in series connected first and second output capacitor is connected to a centre tap of said in series connected first and second switch.

Abstract: A Digital Addressable Lighting Interface, DALI, enabled communication device for transmitting messages over a communication bus having two communication lines, said device comprising a switch connected between said two communication lines, a controller arranged for controlling said switch for imposing logical communication levels on said communication bus, an energy storage device, connected in series with said switch, and arranged for storing electrical energy flowing from said bus through said switch, a bypass circuit arranged for bypassing said energy storage device when a voltage over said energy storage device is above a predetermined voltage threshold.

Abstract: Method for producing a 3D item (1) by means of fused deposition modelling, the method comprising a 3D printing stage comprising layer-wise depositing an extrudate (321) comprising 3D printable material (201), to provide the 3D item (1) comprising 3D printed material (202), wherein the 3D item (1) comprises a plurality of layers (322) of 3D printed material (202), wherein the 3D printing stage comprises: •—a vertical support providing stage comprising providing a first layer (1100) of 3D printed material (202), wherein the first layer (1100) has a first layer top part (1110) with a first layer top height (HI 1) relative to the substrate (1550) and a first layer bottom part (1120) with a first layer bottom height (H12) relative to the substrate (1550), wherein the first layer (1100) has a first layer height (HI) defined by the difference between the first layer top height (HI 1) and the first layer bottom height (H12), wherein the value of the first layer bottom height (H12) is at least equal to the value of th

Abstract: A bias circuit (100) of an avalanche photodiode, APD, comprising: a voltage conversion module (110) connected to the APD, wherein the voltage conversion module (110) is configured to convert an input supply voltage (Vin) to a bias voltage for the APD; an error amplifier (120) connected to the voltage conversion module (110) for implementing a feedback control; a voltage feedback loop (130) configured to provide the error amplifier (120) a first analog signal related to the bias voltage; and a current feedback loop (140) configured to provide the error amplifier (120) a second analog signal related to the APD current; wherein the error amplifier (120) is configured to control the voltage conversion module (110) based on the first and the second analog signals.

Abstract: A light emitting diode, LED, filament arrangement (100) arranged to emit LED filament arrangement light, comprising first and second LED filaments (110a, 110b) arranged to emit first and second LED filament light, respectively, wherein the first and second LED filaments elongate along a first axis, A, and comprise first and second arrays (120a, 120b) of a plurality of first and second LEDs (130a, 130b), a carrier (210) arranged to support the first and second LED filaments, at least one structure (160) arranged to at least partially redirect the first and second LED filament light, wherein the at least one structure is arranged adjacent at least one of the first and second LED filaments, and a controller (180) configured to individually control the operation of the first and second arrays of the plurality of first and second LEDs, respectively.