Driving circuit for driving a plurality of light sources arranged in a series configuration, the circuit comprising: - a controllable current source having output terminals (21, 22), the series arrangement of light sources being connected to said output terminals (21,22); - a plurality of controllable switches, each light source (1(i)) being bridged by a corresponding controllable switch (25(i)); - a controller, having switch control output terminals (31(i)) coupled to respective control terminals of respective switches (25(i)), and having a current control output terminal coupled to a control input of the current source, the controller being designed for generating at its current control output terminal a current control signal (S C) for controlling the operation of the current source, the controller further being designed for generating at its switch control outputs (31(i)) respective switch control signals (S L (i)) for controlling the operative states of the respective switches (25(i)) in order to individually control the light output of the corresponding light sources (1(i)); wherein the controller is capable of individually setting the switch control signals (S L (i)) for the respective switches (25(i)); wherein the controller is designed for generating its switch control signals (S L (i)) as pulse width modulation signals driving the corresponding switches (25(i)) either to their conductive states or to their non-conductive states at a switching frequency, wherein the duty cycle of the switch control signal (S L (i)) determines a light source dim factor (β(i)) in the range between 0 and 1; characterized in that in normal operation, the controller is designed to control the current source such that an average light source current (I AV) has a predefined nominal level (I NOM), and to generate the switch control signals (S L (i)) such that the dim factors (P(i)) are all equal to 1; wherein the controller is capable of boosting the light output of one selected light source (1(x)) while maintaining the light output of other light sources in the series arrangement by adapting its current control signal (S C) such as to increase the average light source current (I AV) by a boost factor (ξ) higher than 1, and to adapt its switch control signals (S L (i)) for said other light sources (1(i)) such as to reduce the dim factors (β(i)) for said other light sources (1(i)). - a controllable current source having output terminals (21, 22), the series arrangement of light sources being connected to said output terminals (21,22); - a plurality of controllable switches, each light source (1(i)) being bridged by a corresponding controllable switch (25(i)); - a controller, having switch control output terminals (31(i)) coupled to respective control terminals of respective switches (25(i)), and having a current control output terminal coupled to a control input of the current source, the controller being designed for generating at its current control output terminal a current control signal (S C) for controlling the operation of the current source, the controller further being designed for generating at its switch control outputs (31(i)) respective switch control signals (S L (i)) for controlling the operative states of the respective switches (25(i)) in order to individually control the light output of the corresponding light sources (1(i)); in normal operation, the controller is designed to control the current source such that an average light source current (I AV) has a predefined nominal level (I NOM), and to generate the switch control signals (S L (i)) such that the dim factors (P(i)) are all equal to 1; wherein the controller is capable of boosting the light output of one selected light source (1(x)) while maintaining the light output of other light sources in the