Operation control device for operating a lighting arrangement, - with an input circuit for provision of an input direct current voltage, - with a control device, - with a converter which is controlled by the control device using a switching signal, and at which the input DC voltage is present on the input side and which provides an output current and an output voltage at its output, wherein the lighting arrangement is connected to the output of the converter, - with an output condenser at which the output voltage is applied, - with means for measuring the lighting current through the lighting arrangement, - and with a control switch which is controlled by the control device for adjusting the brightness of the lighting arrangement and which is connected in series with the lighting arrangement, characterised in that - the control device predefines a nominal value for the output voltage when the control switch is opened which is equal to the lighting voltage when the control switch is closed, and a nominal value (Isoll) for a lighting current when the control switch is closed, - that means for measuring the output voltage present at the output of the converter are present, and the measured value for the lighting current and the measured value for the output voltage are transmitted to the control device for analysis, wherein the control device is configured to store the measured values in a memory before analysis, - that the control device compares the stored measured value for the lighting current and the stored measured value for the output voltage with the respective assigned nominal value (Isoll, UL), - and that the control device is configured to actuate the converter when the control switch is opened such that the converter charges the output condenser during a charging duration (ΔT) before the next closure of the control switch, so that the output current at the output of the converter rises during the charging duration (ΔT) before the control device closes the control switch, wherein the control device, depending on the comparison, adjusts at least two of the following parameters for adaptation of the lighting current and the output voltage to the respective nominal value: - the charging duration (ΔT), - a starting value of the voltage of the output condenser at the start of the charging duration, - a sampling level of the switching signal controlling the converter during the charging duration (ΔT). - with an input circuit for provision of an input direct current voltage, - with a control device, - with a converter which is controlled by the control device using a switching signal, and at which the input DC voltage is present on the input side and which provides an output current and an output voltage at its output, wherein the lighting arrangement is connected to the output of the converter, - with an output condenser at which the output voltage is applied, - with means for measuring the lighting current through the lighting arrangement, - and with a control switch which is controlled by the control device for adjusting the brightness of the lighting arrangement and which is connected in series with the lighting arrangement, - the control device predefines a nominal value for the output voltage when the control switch is opened which is equal to the lighting voltage when the control switch is closed, and a nominal value (Isoll) for a lighting current when the control switch is closed, - that means for measuring the output voltage present at the output of the converter are present, and the measured value for the lighting current and the measured value for the output voltage are transmitted to the control device for analysis, wherein the control device is configured to store the measured values in a memory before analysis, - that the control device compares the stored measured value for the lighting current and the stored measured value for the output voltage with the respective assigned nominal value (Isoll, UL), - and that the control device is configured to actuate the converter when the control switch is opened such that the converter charges the output condenser during a charging duration (ΔT) before the next closure of the control switch, so that the output current at the output of the converter rises during the charging duration (ΔT) before the control device closes the control switch, wherein the control device, depending on the comparison, adjusts at least two of the following parameters for adaptation of the lighting current and the output voltage to the respective nominal value: - the charging duration (ΔT), - a starting value of the voltage of the output condenser at the start of the charging duration, - a sampling level of the switching signal controlling the converter during the charging duration (ΔT).