Method for the frequency-variable control of the light color and/or the luminous flux of a lighting system, the lighting system comprising at least two light sources of different light color, a microcontroller being provided for controlling the at least two light sources, comprising the following steps: a) Receiving an input signal (S in) specifying the light color to be emitted and/or the luminous flux to be emitted by the lighting system, b) Calculating a clock cycle comprising a sequential sequence (Seq) of time duration ratios comprising switch-on time duration ratios (V R, V B, V G) of the at least two light sources to one another, and, if appropriate, an additional operating pause time ratio characterized by switching off all light sources, as a function of the input signal (S in), the sequential sequence being determined in such a way that at any time only at most one of the at least two light sources is active, c) Calculating in each case a switch-on time duration (t eR, t eB, t eG) of the respective light source of the at least two light sources and, if appropriate, an operating pause time duration (t P), in that the switch-on time duration ratios (V R, V B, V G) and, if appropriate, the operating pause time duration ratio are each multiplied by a variable reference time duration (t ref), and calculating a variable cycle time duration (t T) by summing the on-time durations (t eR, t eB, t eG) calculated within the clock cycle and, if applicable, the operating pause time duration (t P), all the time duration ratios (V R, V B, V G, P) and thus the respective time durations (t eR, t eB, t eG) calculated therefrom and the operating pause time duration (t P) calculated, if applicable, being selected in such a way that the luminous color and/or the luminous flux specified in accordance with the input signal (S in) is emitted as a time average within the variable clock time duration (t T), d) Control of the switch-on and switch-off processes of the at least two light sources by means of the microcontroller in order to implement the sequential sequence (Seq) calculated in accordance with step b), using the respective switch-on time durations (t eR, t eB, t eG) calculated in accordance with step c) and the operating pause time duration (t P) calculated if necessary. a) Receiving an input signal (S in) specifying the light color to be emitted and/or the luminous flux to be emitted by the lighting system, b) Calculating a clock cycle comprising a sequential sequence (Seq) of time duration ratios comprising switch-on time duration ratios (V R, V B, V G) of the at least two light sources to one another, and, if appropriate, an additional operating pause time ratio characterized by switching off all light sources, as a function of the input signal (S in), the sequential sequence being determined in such a way that at any time only at most one of the at least two light sources is active, c) Calculating in each case a switch-on time duration (t eR, t eB, t eG) of the respective light source of the at least two light sources and, if appropriate, an operating pause time duration (t P), in that the switch-on time duration ratios (V R, V B, V G) and, if appropriate, the operating pause time duration ratio are each multiplied by a variable reference time duration (t ref), and calculating a variable cycle time duration (t T) by summing the on-time durations (t eR, t eB, t eG) calculated within the clock cycle and, if applicable, the operating pause time duration (t P), all the time duration ratios (V R, V B, V G, P) and thus the respective time durations (t eR, t eB, t eG) calculated therefrom and the operating pause time duration (t P) calculated, if applicable, being selected in such a way that the luminous color and/or the luminous flux specified in accordance with the input signal (S in) is emitted as a time average within the variable clock time duration (t T), d) Control of the switch-on and switch-off processes of the at least two light sources by means of the microcontroller in order to implement the sequential sequence (Seq) calculated in accordance with step b), using the respective switch-on time durations (t eR, t eB, t eG) calculated in accordance with step c) and the operating pause time duration (t P) calculated if necessary.