A driver is provided for driving at least two sets of solid state lighting elements. A switched capacitor power converter is provided, and a switch arrangement is used for selectively connecting a first set and a second set of solid state lighting elements in series connection at the output of the power converter or connecting the first set of solid state lighting elements at the output of the power converter without the second set of solid state lighting elements. A first duty cycle of the switched capacitor power converter and a second duty cycle control of the switch arrangement are both controlled. In this driver design, a switched capacitor power converter and a switch arrangement are independently controlled using a duty cycle approach. The switched capacitor power converter is used to provide current control, and the switch arrangement is used to control whether the second set of lighting elements is connected to the output or not.