LIGHT UNIT AND METHOD FOR CONTROLLING A LIGHT UNIT

摘要

A light unit (10) including one or more lighting devices, in particular one or more LEDs is disclosed. The light unit comprises input terminals (12, 14) for connecting the light unit to an external power supply (16) and for receiving an input voltage (V10) from the external power supply. A first lighting device and at least one additional lighting device (22, 24) connected in series to the input terminals and a charge storage device (26) is connected in series to the first lighting device. The first lighting device (20) and the additional lighting device (22, 24) forms a tapped linear driver that the number of the lighting device (20, 22, 24) being turned on depending on an amplitude of the input voltage (V10). The first lighting device or a second lighting device (30) is electrically connectable in parallel to the charge storage device via an additional current path (33, 52), wherein the charge storage device is adapted be switched in series with the tapped linear driver and be charged within a second time duration (t4 to t5), when the input voltage (V10) is above a threshold, and discharge when the input voltage (V10) is below a certain level, to provide electrical power to the first lighting device or the second lighting device for powering the first lighting device or the second lighting device.