Abstract: A method and a circuit arrangement for feeding n LED units (LED1 to LED5) of a lighting unit of a motor vehicle by way of a controlled power source (5) from a voltage source (2) having a fluctuating operating voltage (UB), in which the LED units (LED1 to LED5) are interconnected, and in particular k LED units (LED1 to LED5) of a series connection are short-circuited, when the operating voltage (UB) drops, taking a stored weighting with respect to the priority assigned to individual LED units into consideration, wherein current continues to flow simultaneously through (n?k) LED units.

Abstract: The invention relates to a method for producing a lighting unit of a vehicle headlight, comprising the following steps: provision of a printed circuit board (1) comprising a plurality of groups (A, B, C) of contact pads (2) for contacting LEDs (3), population of contact pads (2) in the groups (A, B, C) with LEDs (3), wherein the contact pads (2) to be populated are selected according to a desired light function of the respective group (A, B, C), and provision of securing means (A?, B?, C?) for reflectors (A?, B?, C?) on the printed circuit board (1), wherein each securing means (A?, B?, C?) is specifically designed for a reflector (A?, B?, C?) that is adapted to the light function of the respective group (A, B, C).

Abstract: A method for symmetrising the branches of a lighting device for vehicles having at least two LED branches (ZW1, ZW2 . . . ZWn) connected in parallel. Each branch has at least one series resistor (R1 . . . Rn) and at least one LED (D11 . . . Dn2) connected in series. The at least one series resistor (R1 . . . Rn) of each branch is bridged by a conducting track (LA1 . . . LAn) provided on a printed circuit board. This conducting track is accessible for a tool of a depanelling device, with the aid of which said conducting track can be severed. The current through each branch and/or the brightness of at least one LED (D11 . . . Dn2) is measured in each branch, and in a branch in which the measured current and/or the measured brightness exceeds a definable limit value, the bridging conducting track of the at least one series resistor is severed with aid of the tool.

Abstract: A method and a circuit arrangement for feeding n LED units (LED1 to LED5) of a lighting unit of a motor vehicle by way of a controlled power source (5) from a voltage source (2) having a fluctuating operating voltage (UB), in which the LED units (LED1 to LED5) are interconnected, and in particular k LED units (LED1 to LED5) of a series connection are short-circuited, when the operating voltage (UB) drops, taking a stored weighting with respect to the priority assigned to individual LED units into consideration, wherein current continues to flow simultaneously through (n?k) LED units.

Abstract: The invention relates to a method for producing a lighting unit of a vehicle headlight, comprising the following steps: provision of a printed circuit board (1) comprising a plurality of groups (A, B, C) of contact pads (2) for contacting LEDs (3), population of contact pads (2) in the groups (A, B, C) with LEDs (3), wherein the contact pads (2) to be populated are selected according to a desired light function of the respective group (A, B, C), and provision of securing means (A?, B?, C?) for reflectors (A?, B?, C?) on the printed circuit board (1), wherein each securing means (A?, B?, C?) is specifically designed for a reflector (A?, B?, C?) that is adapted to the light function of the respective group (A, B, C).