Power source type determiner

A power source type determiner for identifying a type of a power source for powering a LED lighting unit, wherein one possible type of a power source comprises a ballast originally designed for a discharge lamp, the power source type determiner comprising:

• a control arrangement adapted to set a forward voltage level across the LED lighting unit to at least a first forward voltage and a second forward voltage, lower than the first forward voltage;
• a monitoring system adapted to monitor an electrical parameter of the load or of the power source;
• and
• a type determination unit adapted to:
• receive, from the monitoring system, a first value of the electrical parameter, wherein the first value is obtained during a response of the power source to the control arrangement setting the forward voltage of the LED lighting unit to the first forward voltage;
• and
• process the first value to generate a type indicating signal indicating the type of the power source;
• wherein the electrical parameter comprises the occurrence of a pulse in a voltage level provided by the power source.