A driving circuitry for a lighting arrangement comprising at least one light emitting diode, the driving circuitry comprising a primary side galvanically separated from a secondary side, wherein the driving circuitry further comprises: - a primary side switched power converter comprising a transformer having a primary and a secondary winding, wherein the primary side power converter is configured to receive an alternating voltage input and to provide a rippled direct current output; - a first control unit having computational capability, the first control unit connected to and configured to control the operation of the primary side switched power converter using a primary switching frequency; - a secondary side switched power converter configured to receive the rippled DC output from the primary side power converter and to provide a ripple reduced DC output to the lighting arrangement; - a second control unit having computational capability, the second control unit connected to and configured to control the operation of the secondary side switched power converter; - a bulk capacitor connected to the input of the secondary side switched power converter; and - a digital communication interface configured to allow a galvanically separated bi-directional data communication between the first and the second control unit, wherein the second control unit is further configured to adjust a secondary switching frequency for the secondary side switched power converter according to a secondary side switching pattern and to receive a representation of a sampled voltage level across the bulk capacitor and to transmit the representation of the sampled voltage level to the first control unit and wherein the first control unit is further configured to control a current level at the primary side switched power converter based on the sampled voltage level of the bulk capacitor received from the second control unit and to control the primary switching frequency of the primary side switched power converter based on a primary side switching pattern, characterized in that the second control unit is configured to transmit the secondary switching frequency to the first control unit and the first control unit is further configured to base the primary switching frequency on the secondary switching frequency received from the second control unit wherein the primary and the secondary switching frequency follows the same switching pattern so that the frequency content of a base tone and or overtones are in phase or at a defined phase shift in relation to each other. - a primary side switched power converter comprising a transformer having a primary and a secondary winding, wherein the primary side power converter is configured to receive an alternating voltage input and to provide a rippled direct current output; - a first control unit having computational capability, the first control unit connected to and configured to control the operation of the primary side switched power converter using a primary switching frequency; - a secondary side switched power converter configured to receive the rippled DC output from the primary side power converter and to provide a ripple reduced DC output to the lighting arrangement; - a second control unit having computational capability, the second control unit connected to and configured to control the operation of the secondary side switched power converter; - a bulk capacitor connected to the input of the secondary side switched power converter; and - a digital communication interface configured to allow a galvanically separated bi-directional data communication between the first and the second control unit,