A method for starting up an illuminating process of a plurality of series connected LEDs by means of a LED driver is described, whereby a maximum allowed voltage output of the LED driver is lower than a forward voltage of the plurality of series connected LEDs in a cold state.
The method comprises:



d) providing a first current, in value lower than a desired current, by the LED driver to the plurality of series connected LEDs, resulting in a forward voltage across the plurality of series connected LEDs lower than the maximum allowed voltage output of the LED driver,
e) waiting during a predetermined wait time period,
f) stepping up of the first current to a second current provided by the LED driver to the plurality of series connected LEDs.