System , comprising: - a PFC module - a load circuit having an LED track with one or more LEDs, the PFC module comprising an actively clocked PFC circuit having at least one controlled switch (S1), - wherein the actively clocked PFC circuit is connected directly or indirectly to the load circuit, and further comprising - an integrated circuit , preferably a microcontroller, as a control unit, which controls the at least one switch (S1) of the actively clocked PFC circuit at a fixed operating frequency in the discontinuous current mode (DCM), wherein the integrated control circuit is adjusted to set the switch-on time (t ON ) of the at least one switch (S1) according to the amplitude of the input voltage (Vin) of the actively clocked PFC circuit and to keep the switch on-time (t ON ) constant for two consecutive switching cycles within a half-wave of the input voltage (V IN ) in order to adjust a maximum value of a current received by the PFC circuit in each second switching cycle to a half-wave of a sinusoidal envelope, wherein the integrated circuit is adjusted to set the switch-on time (ton) of the at least one switch (S1) further according to the output voltage of the actively clocked PFC circuit , so that the actual value of the output voltage of the PFC circuit corresponds to a setpoint value, - wherein the integrated circuit is further adjusted to control the actively clocked PFC circuit on the basis of at least one feedback variable from the load circuit, wherein the at least one feedback variable from the load circuit comprises at least one of the following variables: an LED current, an LED voltage, a temperature of the LED track , a light power emitted by the LED track , or an electrical power received by the LED track . - a PFC module - a load circuit having an LED track with one or more LEDs, the PFC module comprising an actively clocked PFC circuit having at least one controlled switch (S1), - wherein the actively clocked PFC circuit is connected directly or indirectly to the load circuit, and further comprising - an integrated circuit , preferably a microcontroller, as a control unit, which controls the at least one switch (S1) of the actively clocked PFC circuit at a fixed operating frequency in the discontinuous current mode (DCM), wherein the integrated control circuit is adjusted to set the switch-on time (t ON ) of the at least one switch (S1) according to the amplitude of the input voltage (Vin) of the actively clocked PFC circuit and to keep the switch on-time (t ON ) constant for two consecutive switching cycles within a half-wave of the input voltage (V IN ) in order to adjust a maximum value of a current received by the PFC circuit in each second switching cycle to a half-wave of a sinusoidal envelope, wherein the integrated circuit is adjusted to set the switch-on time (ton) of the at least one switch (S1) further according to the output voltage of the actively clocked PFC circuit , so that the actual value of the output voltage of the PFC circuit corresponds to a setpoint value, - wherein the integrated circuit is further adjusted to control the actively clocked PFC circuit on the basis of at least one feedback variable from the load circuit, wherein the at least one feedback variable from the load circuit comprises at least one of the following variables: an LED current, an LED voltage, a temperature of the LED track , a light power emitted by the LED track , or an electrical power received by the LED track . <EOS>