A head lamp lighting system of a vehicle includes a DC/DC boost converter configured to provide a common boosted output voltage from a battery voltage, a plurality of DC/DC buck converters, each DC/DC buck converter being configured to provide an adjusted buck output current from the common boosted output voltage, a plurality of strings of Light-Emitting Diodes, each string of Light-Emitting Diodes being electrically connected to only one adjusted buck output current and vice versa, a main controller electrically connected to the DC/DC boost converter and configured to provide a boost switching frequency value to the DC/DC boost converter, a battery voltage supervisor electrically connected to the main controller and electrically connected to the battery voltage, said battery voltage supervisor being configured to provide the battery voltage value to the main controller; the main controller being configured to determine the boost switching frequency value according to the battery voltage value.