Automotive light comprising: a substantially basin-shaped rear casing; a front half-shell which is arranged to close the mouth of the rear casing; and at least one lighting assembly that emits light on command, and is located inside the rear casing so as to be able to selectively backlight a corresponding transparent or semitransparent sector of the front half-shell; the lighting assembly comprising: a light-guide bar that is made of photoconductive material and is adapted to channel the light by total internal reflection; and at least one electrically-powered light source which is located inside the rear casing, close to a proximal end of the light-guide bar, and is adapted to selectively direct, towards the same proximal end, a light beam that enters into the body of the light-guide bar; said light source comprising: a supporting board located inside the rear casing adjacent to the proximal end of the light-guide bar; and one or more LEDs placed on a face of the supporting board within a given active area, so as to face the proximal end of the light-guide bar; the automotive light being characterised in that the light source additionally comprises an oblique guiding slide which is slanted towards the active area of said supporting board, ends substantially at the perimeter border of said active area, and is adapted to slide the proximal end of the light-guide bar towards the active area of the supporting board; and in that the proximal end of the light-guide bar is provided with a platelike head that extends to cover the active area of the supporting board, with its lower face locally skimmed over the LED(s), and with a spacer protrusion or shoulder which juts out beyond the lower face of the platelike head, and is adapted to abut against the supporting board so as to keep the lower face of the platelike head at a given distance from the underlying LED or LEDs; said spacer protrusion or shoulder being adapted to rest in free sliding manner onto said oblique guiding slide during the coupling of the proximal end of the light-guide bar with said light source. the lighting assembly comprising: a light-guide bar that is made of photoconductive material and is adapted to channel the light by total internal reflection; and at least one electrically-powered light source which is located inside the rear casing, close to a proximal end of the light-guide bar, and is adapted to selectively direct, towards the same proximal end, a light beam that enters into the body of the light-guide bar; said light source comprising: a supporting board located inside the rear casing adjacent to the proximal end of the light-guide bar; and one or more LEDs placed on a face of the supporting board within a given active area, so as to face the proximal end of the light-guide bar; the automotive light being characterised in that the light source additionally comprises an oblique guiding slide which is slanted towards the active area of said supporting board, ends substantially at the perimeter border of said active area, and is adapted to slide the proximal end of the light-guide bar towards the active area of the supporting board; and in that the proximal end of the light-guide bar is provided with a platelike head that extends to cover the active area of the supporting board, with its lower face locally skimmed over the LED(s), and with a spacer protrusion or shoulder which juts out beyond the lower face of the platelike head, and is adapted to abut against the supporting board so as to keep the lower face of the platelike head at a given distance from the underlying LED or LEDs; said spacer protrusion or shoulder being adapted to rest in free sliding manner onto said oblique guiding slide during the coupling of the proximal end of the light-guide bar with said light source.