Light-emitting device and photo-therapy device comprising a light-emitting device

A light-emitting device comprising:

• a light-emitting module comprising a plurality of sets of light-emitting elements, wherein at least two of said sets have a different number of light-emitting elements;
• a power module adapted to selectively convey electrical power to the plurality of sets during respective non-overlapping time intervals for powering the respective sets;
• a control module being adapted to control the power module to convey power to the plurality of sets during respective non-overlapping time intervals until power has been conveyed to each set of the plurality of sets at least once;
• wherein the power module is configured such that it has an upper capacity limit with respect to an electrical power that can be conveyed to the plurality of sets, the upper capacity limit corresponding to an electrical power requirement of a largest set, having a maximum number of light-emitting elements, of the plurality of sets at a given momenta and
• wherein the plurality of sets of light-emitting elements are arranged to provide spatially interweaved sets of light-emitting elements and the control module is adapted to convey power to the plurality of sets in such an order so as to minimize average spatial separation between subsequently powered sets of the plurality of sets on basis of the interweaved arrangement of the plurality of sets relatively to each other in the light-emitting device.