A driver system for driving a plurality of LED's, the driver system comprising: a central control module having an input for receiving operating data, and at least one driver module for driving at least one of the LEDs, each of the at least one driver modules comprising: - a hysteretical converter for generating a current to power at least one LED, and - a controller (uC), being a microcontroller, electrically connected to the hysteretical converter and configured to control the hysteretical converter at a determined controller cycle time, wherein the hysteretical converter comprises a reference source (Vref), a comparator (COMP) for comparing a signal representing a current supplied by the hysteretical converter with a reference signal supplied by the reference source, a switch driven by the comparator, a transition of an output level of the comparator resulting in a switching of the switch from conductive to non-conductive or vice versa, an inductor in series connection with the switch and the at least one LED, a fly-back diode to allow current flow when the switch is non-conductive, and a current measurement element configured to provide to the comparator the signal representing the current supplied by the hysteretical converter, the hysteretical converter configured to operate the switch at a switching cycle to generate the current to power the at least one LED, characterized in that the comparator comprises an enable input and the controller is configured to dim the at least one LED by applying at least one enable pulse via the enable input to the comparator in the controller cycle time, each of the at least one enable pulse having a pulse width less than one switching cycle of the hysteretic converter and the controller cycle time being greater than the switching cycle of the hysteretic converter, and in that the controller cycle time is divided into a plurality of sub cycle time parts and each enable pulse is provided in a respective sub cycle time part, and the controller is further configured to operate the at least one LED at an intensity level by providing at least one enable pulse to the enable input of the comparator in the controller cycle time, and to increase the intensity level of the at least one LED by adding another enable pulse in the same controller cycle time in a random sub cycle time part in respect of enable pulses already present in other sub cycle time parts of the same controller cycle time, or by adding another enable pulse in a sub cycle time part most distant in time from enable pulses already present in the same controller cycle time. a central control module having an input for receiving operating data, and at least one driver module for driving at least one of the LEDs, each of the at least one driver modules comprising: - a hysteretical converter for generating a current to power at least one LED, and - a controller (uC), being a microcontroller, electrically connected to the hysteretical converter and configured to control the hysteretical converter at a determined controller cycle time, - a hysteretical converter for generating a current to power at least one LED, and - a controller (uC), being a microcontroller, electrically connected to the hysteretical converter and configured to control the hysteretical converter at a determined controller cycle time, wherein the hysteretical converter comprises a reference source (Vref), a comparator (COMP) for comparing a signal representing a current supplied by the hysteretical converter with a reference signal supplied by the reference source, a switch driven by the comparator, a transition of an output level of the comparator resulting in a switching of the switch from conductive to non-conductive or vice versa, an inductor in series connection with the switch and the at least one LED, a fly-back diode to allow current flow when the switch is non-conductive, and a current measurement element configured to provide to the comparator the signal representing the current supplied by the hysteretical converter, the hysteretical converter configured to operate the switch at a switching cycle to generate the current to power the at least one LED, characterized in that the comparator comprises an enable input and the controller is configured to dim the at least one LED by applying at least one enable pulse via the enable input to the comparator in the controller cycle time, each of the at least one enable pulse having a pulse width less than one switching cycle of the hysteretic converter and the controller cycle time being greater than the switching cycle of the hysteretic converter, and in that the controller cycle time is divided into a plurality of sub cycle time parts and each enable pulse is provided in a respective sub cycle time part, and the controller is further configured to operate the at least one LED at an intensity level by providing at least one enable pulse to the enable input of the comparator in the controller cycle time, and to increase the intensity level of the at least one LED by adding another enable pulse in the same controller cycle time in a random sub cycle time part in respect of enable pulses already present in other sub cycle time parts of the same controller cycle time, or by adding another enable pulse in a sub cycle time part most distant in time from enable pulses already present in the same controller cycle time.