The invention relates to a method and to a circuit arrangement for feeding n LED units (LED1,...LED5) of a lamp unit of a motor vehicle by means of a controlled current source (5) from a voltage source (2) having fluctuating operating voltage (UB), in which the connecting of the LED units (LED1,...LED5) in the event of the operating voltage (UB) falling is carried out whilst taking into account a stored weighting with regard to the priority assigned to the individual LED units, in particular each k LED units (LED1,...,LED5) of a series circuit are short-circuited, wherein at the same time (n-k) LED units remain energized. At the same time, a control unit (3) for driving the current source is assigned a storage unit (7) for storing information about weightings relating to the priority of specific LED units, a switching matrix (4', S1,..., S4), in particular a switch arrangement of n controlled switches (S1,..., S4) each bridging the LED units (LED1,..., LED4, LED5) is provided, and the control unit (3) is configured to compare the operating voltage and / or the current (IS) from the current source with predefined threshold values and to carry out the connection of the LED units on the basis of this comparison and the weighting.