Abstract: Apparatus, methods and systems are disclosed related to negotiation mechanism among control devices (200, 200a, 200b, 200c, 200d) each having a dedicated hierarchy level configured to obtain DC current from the control network (100) with at least a power source (300, 300?) on the network (100). The control device (200, 200a) with a higher dedicated hierarchy level may request another control device (200b, 200c, 200d) with a lower dedicated hierarchy level to release current for its use, when the available current at the power source (300, 300?) is not sufficient.

Abstract: The invention provides a system (100) comprising: a lighting device (1) comprising a sensor (4) and a light source (5), wherein the sensor (4) is configured to detect a presence in a space (10) and/or to detect an emulator signal (6), wherein the light source (4) is configured to provide ultraviolet light (7) in operation and to interrupt providing said ultraviolet light (7) in operation when the sensor (4) detects presence in said space (10); an emulator device (2) configured to convey the emulator signal (6) to the sensor (4); a controller (3) configured to control the emulator device (2) to transmit the emulator signal (6) at a first moment in time, and to determine a verification condition of the sensor (4) if the sensor (4) detects the emulator signal (6) at the first moment in time.

Abstract: A power supply for an LED lighting unit. The power supply comprises two power converters, either of which may provide the power to be drawn by components of the LED lighting unit. In particular, a controller of the power supply controls which power converter converts a mains power supply to a power level for a connected LED lighting unit. The two power converters are designed to be efficient when providing different power levels.

Abstract: Apparatus, methods and systems are disclosed related to negotiation mechanism among control devices (200, 200a, 200b, 200c, 200d) each having a dedicated hierarchy level configured to obtain DC current from the control network (100) with at least a power source (300, 300?) on the network (100). The control device (200, 200a) with a higher dedicated hierarchy level may request another control device (200b, 200c, 200d) with a lower dedicated hierarchy level to release current for its use, when the available current at the power source (300, 300?) is not sufficient.

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: A power supply for an LED lighting unit. The power supply comprises two power converters, either of which may provide the power to be drawn by components of the LED lighting unit. In particular, a controller of the power supply controls which power converter converts a mains power supply to a power level for a connected LED lighting unit. The two power converters are designed to be efficient when providing different power levels.