Light device for motor vehicles comprising at least two groups of light sources producing at least two different light beams, comprising a device (100, 800, 900) for controlling the electrical supply of the at least two groups of light sources the light device (100, 800, 900) comprising - a switching voltage converter circuit (110, 210, 310, 410, 510, 610, 710, 710, 810, 810, 910), said converter circuit comprising means (112, 212, 312, 412, 512, 612, 712, 812, 912) for generating a switched voltage signal (114, 214, 314, 414, 514, 614, 714, 814, 914) from a DC input voltage, - primary output means (116, 216, 316, 316, 416, 516, 516, 616, 716, 816, 816, 916) for converting said switched voltage signal (114, 214, 314, 414, 514, 614, 714, 814, 914) into a first DC output voltage having a first voltage level and for supplying a first group of light sources, - secondary output means (126, 226, 326, 326, 426, 526, 626, 726, 826, 826, 926) for converting said switched voltage signal (114, 214, 314, 414, 514, 614, 714, 814, 914) into at least one second DC output voltage having a second voltage level and for supplying a second light source group, the secondary output means (126, 226, 326, 326, 426, 526, 626, 726, 826, 826, 926) include an electronic circuit including capacitors and diodes and which does not include a switching element and/or integrated circuit and/or microcontroller element, the secondary output means (126, 226, 326, 326, 426, 526, 626, 726, 826, 826, 926) include linear means for regulating the output electrical current, formed by a linear current regulator complementing the second output voltage, the second voltage level is higher than the first voltage level, the light device being characterized in that the first group of light sources, performing all or part of a first light function, is supplied by the first output voltage and in that the second group of light sources, performing all or part of a second light function, is supplied by the second output voltage of the control device, in that it comprises at least one switch (S2, S3) for connecting the first light source group to the first output voltage and one switch for connecting the second light source group to the first output voltage, and in that all or part of the second light function is supplied by the second secondary output voltage of the control device (100, 800, 900), while all or part of the first light function is supplied by the first output voltage when the at least one switch (S2, S3) for connecting the first light source group is closed and the switch for connecting the second light source group is opened and the linear current controller connects the secondary output means (126, 226, 326, 426, 426, 526, 626, 726, 826, 926) to the second light source group. - a switching voltage converter circuit (110, 210, 310, 410, 510, 610, 710, 710, 810, 810, 910), said converter circuit comprising means (112, 212, 312, 412, 512, 612, 712, 812, 912) for generating a switched voltage signal (114, 214, 314, 414, 514, 614, 714, 814, 914) from a DC input voltage, - primary output means (116, 216, 316, 316, 416, 516, 516, 616, 716, 816, 816, 916) for converting said switched voltage signal (114, 214, 314, 414, 514, 614, 714, 814, 914) into a first DC output voltage having a first voltage level and for supplying a first group of light sources, - secondary output means (126, 226, 326, 326, 426, 526, 626, 726, 826, 826, 926) for converting said switched voltage signal (114, 214, 314, 414, 514, 614, 714, 814, 914) into at least one second DC output voltage having a second voltage level and for supplying a second light source group, the secondary output means (126, 226, 326, 326, 426, 526, 626, 726, 826, 826, 926) include an electronic circuit including capacitors and diodes and which does not include a switching element and/or integrated circuit and/or microcontroller element, the secondary output means (126, 226, 326, 326, 426, 526, 626, 726, 826, 826, 926) include linear means for regulating the output electrical current, formed by a linear current regulator complementing the second output voltage, the second voltage level is higher than the first voltage level,