A method for operating an automotive lighting device comprising at least a first light module and a second light module, each one of the light modules comprising solid-state light sources, the method comprising the steps of: - providing a first preliminary current profile to feed the first light module so that the first light module produces a light flux greater than a first flux threshold value, - calculating a first preliminary derating time associated to the first preliminary current profile, wherein the first preliminary current profile involves a first preliminary amount of current until the first preliminary derating time; - providing a second preliminary current profile to feed the second light module so that the second light module produces a light flux greater than a second flux threshold value - calculating a second preliminary derating time associated to the second preliminary current profile, the second preliminary derating time being higher than the first preliminary derating time, wherein the second preliminary current profile involves a second preliminary amount of current until the second preliminary derating time; - feeding the first light module with a first current profile which provides a total amount of current lower than the first preliminary amount of current, calculated until the first preliminary derating time; - feeding the second light module with a second current profile which provides a total amount of current higher than the second preliminary amount of current, calculated until the second preliminary derating time; - the method characterised in that the first current profile and the second current profile comprise starting with a first current value and increasing the current value when a predetermined condition is reached. - providing a first preliminary current profile to feed the first light module so that the first light module produces a light flux greater than a first flux threshold value, - calculating a first preliminary derating time associated to the first preliminary current profile, wherein the first preliminary current profile involves a first preliminary amount of current until the first preliminary derating time; - providing a second preliminary current profile to feed the second light module so that the second light module produces a light flux greater than a second flux threshold value - calculating a second preliminary derating time associated to the second preliminary current profile, the second preliminary derating time being higher than the first preliminary derating time, wherein the second preliminary current profile involves a second preliminary amount of current until the second preliminary derating time; - feeding the first light module with a first current profile which provides a total amount of current lower than the first preliminary amount of current, calculated until the first preliminary derating time; - feeding the second light module with a second current profile which provides a total amount of current higher than the second preliminary amount of current, calculated until the second preliminary derating time; - the method characterised in that the first current profile and the second current profile comprise starting with a first current value and increasing the current value when a predetermined condition is reached.