A system comprising an illuminant and a dimmable converter for driving the illuminant, the dimmable converter comprising: • a power conversion control unit (24, 24'), • an isolated power conversion unit (12, 12') comprising a switch arranged on a primary side of the isolated power conversion unit (12, 12'), • a first transmission means, • a second isolated transmission means, • an interface control circuit, • an output rectification and filter unit, • wherein a primary side of the isolated power conversion unit (12, 12') is configured to receive a direct current and is further configured to convert the direct current into a first output current provided on a secondary side of the isolated power conversion unit (12, 12') and is further configured to send the first output current to the output rectification and filter unit, • wherein the output rectification and filter unit is configured to rectify and filter the first output current, thereby arriving at a second output current, the output rectification and filter unit is further configured to send the second output current to the illuminant, characterized in that the first transmission means is an isolated transmission means and the output rectification and filter unit is further configured to send the first output current as an input signal of the first isolated transmission means to a primary side of the first isolated transmission means and, • wherein the primary side of the first isolated transmission means is configured to receive the first output current from the output rectification and filter unit and the first isolated transmission means is configured to convert the first output current into a third output current provided on a secondary side of the first isolated transmission means and the primary side of the first isolated transmission means is further configured to send the first output current back to the secondary side of the isolated power conversion unit (12,12'), • wherein the interface control circuit is configured to receive the third output current, to receive a dimming signal and to generate a first control signal based on the third output current and the dimming signal, • wherein the second isolated transmission means is configured to receive the first control signal from the interface control circuit and convert the first control signal into a second control signal, • wherein the power conversion control unit (24, 24') is configured to control a switching of the switch based on the second control signal, thereby setting the first output current to a value suitable to generate a desired light intensity to be emitted by the illuminant and indicated by the dimming signal. • a power conversion control unit (24, 24'), • an isolated power conversion unit (12, 12') comprising a switch arranged on a primary side of the isolated power conversion unit (12, 12'), • a first transmission means, • a second isolated transmission means, • an interface control circuit, • an output rectification and filter unit, • wherein a primary side of the isolated power conversion unit (12, 12') is configured to receive a direct current and is further configured to convert the direct current into a first output current provided on a secondary side of the isolated power conversion unit (12, 12') and is further configured to send the first output current to the output rectification and filter unit, • wherein the output rectification and filter unit is configured to rectify and filter the first output current, thereby arriving at a second output current, the output rectification and filter unit is further configured to send the second output current to the illuminant, characterized in that • wherein the primary side of the first isolated transmission means is configured to receive the first output current from the output rectification and filter unit and the first isolated transmission means is configured to convert the first output current into a third output current provided on a secondary side of the first isolated transmission means and the primary side of the first isolated transmission means is further configured to send the first output current back to the secondary side of the isolated power conversion unit (12,12'), • wherein the interface control circuit is configured to receive the third output current, to receive a dimming signal and to generate a first control signal based on the third output current and the dimming signal, • wherein the second isolated transmission means is configured to receive the first control signal from the interface control circuit and convert the first control signal into a second control signal, • wherein the power conversion control unit (24, 24') is configured to control a switching of the switch based on the second control signal, thereby setting the first output current to a value suitable to generate a desired light intensity to be emitted by the illuminant and indicated by the dimming signal.