A circuit arrangement comprising at least a first light emitting diode (LD R) and a second light emitting diode (LD G) emitting light of different colours arranged adjacent to each other for additive colour mixing to provide a desired colour; a temperature sensing circuit (2R, 2G; 3; 4) configured to provide a temperature signal (T R ', T G ') representing the temperature(s) of the light emitting diodes (LD R, LD G), wherein the temperature sensing circuit includes a sigma-delta-modulator configured to generate, as temperature signal (T R ', T G '), a stream of bits or digital words whose time average represents the sensed temperature(s); a current source (Q R, Q G) for each light emitting diode (LD R, LD G) configured to provide the light emitting diodes (LD R, LD G) with respective load currents (i R, i G) in accordance with corresponding control signals received by the current sources (Q R, Q G); a first and a second modulator unit (1; 1b, 1c) configured to generate the control signals which are modulated such that the time average value of each control signal corresponds to the value of a corresponding input signal (I R, I G) of the respective modulator unit; and a calibration circuit (10', 12; 10, MUX, 12) configured to provide the input signals (I R, I G) dependent on a colour signal defining the desired colour and dependent on the stream of bits or digital words forming the temperature signal (T R ', T G '), wherein the calibration circuit includes a lookup table unit (10'; 10, MUX) including colour calibration data for different discrete temperature values, the lookup table unit is configured to provide a set of calibration data (S R, S G; S R ·C R, S G ·C G) selected dependent on the temperature signal (T R ', T G '), the input signals (I R, I G) of the sigma-delta modulators being responsive to the selected set of calibration data (S R, S G; S R ·C R, S G ·C G), wherein the lookup table unit comprises a calibration table including selectable calibrated current values (S R, S G) for the LEDs associated with a defined colour value; the current values (S R, S G) being calibrated for a reference temperature and the selection of the calibrated current values (S R, S G) being based on the colour signal; a compensation table including selectable compensation coefficients (C R, C G), each coefficient being associated with one LED (LD R, LD G) and a discrete temperature value, the selection of the compensation coefficients (C R, C G) being based on the temperature signal (T R ', T G '), wherein the calibrated current values are combined with the respective compensation coefficients to provide, as calibration data, corresponding current values recalibrated for the sensed temperature(s). at least a first light emitting diode (LD R) and a second light emitting diode (LD G) emitting light of different colours arranged adjacent to each other for additive colour mixing to provide a desired colour; a temperature sensing circuit (2R, 2G; 3; 4) configured to provide a temperature signal (T R ', T G ') representing the temperature(s) of the light emitting diodes (LD R, LD G), wherein the temperature sensing circuit includes a sigma-delta-modulator configured to generate, as temperature signal (T R ', T G '), a stream of bits or digital words whose time average represents the sensed temperature(s); a current source (Q R, Q G) for each light emitting diode (LD R, LD G) configured to provide the light emitting diodes (LD R, LD G) with respective load currents (i R, i G) in accordance with corresponding control signals received by the current sources (Q R, Q G); a first and a second modulator unit (1; 1b, 1c) configured to generate the control signals which are modulated such that the time average value of each control signal corresponds to the value of a corresponding input signal (I R, I G) of the respective modulator unit; and a calibration circuit (10', 12; 10, MUX, 12) configured to provide the input signals (I R, I G) dependent on a colour signal defining the desired colour and dependent on the stream of bits or digital words forming the temperature signal (T R ', T G '), wherein the calibration circuit includes a lookup table unit (10'; 10, MUX) including colour calibration data for different discrete temperature values, the lookup table unit is configured to provide a set of calibration data (S R, S G; S R ·C R, S G ·C G) selected dependent on the temperature signal (T R ', T G '), the input signals (I R, I G) of the sigma-delta modulators being responsive to the selected set of calibration data (S R, S G; S R ·C R, S G ·C G), wherein the lookup table unit comprises