Current determination apparatus

A current determination apparatus for determining an operational driving current for driving a light source of a group of light sources, the light sources being adapted to change a color of light emitted by the light sources depending on a change of a driving current used for driving the respective light source, the current determination apparatus comprising:

• a light characteristic shift function providing unit for providing a color shift function defining a shift of the color of light emitted by a light source of the group of light sources depending on the driving current of the light source, the color shift function being the same for all light sources of the group,
• a target window providing unit for providing a target color window,
• a nominal light characteristic providing unit for providing a nominal color of the light emitted by a light source of the group of light sources, if the light source is driven by a nominal driving current,
• a current determination unit for determining an operational driving current based on the color shift function, the target color window and the nominal color such that the color of the light emitted by the light source of the group of light sources is shifted from the nominal color to a color within the target color window.