Driver device and driving method for driving a load

Driver device for driving a load, in particular a light unit comprising one or more LED's, comprising:

• input terminals for connecting the driver device to an external electrical power supply and for receiving an input voltage,
• a power converter unit connected to the input terminals for converting the input voltage to a drive voltage and/or a drive current for powering the load,
• a control unit connected to the power converter unit for controlling an electrical power provided by the power converter unit to the load,
• an input device connected to the control unit for setting a power level of the electrical power provided by the power converter unit to the load, and
• a memory device comprised in the control unit, characterized in that the control unit is adapted to determine a minimum power level of the electrical power that can be drawn from the input terminals and to store the determined level of the electrical power in the memory device, and wherein the control unit is adapted to control that the electrical power which is drawn from the external electrical power supply does not drop below the minimum power level.