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 light-guide bar being suspended/supported inside the rear casing by one or more supporting brackets which jut out cantilevered from the light-guide bar and rest on the rear casing; the light source additionally comprising an oblique guiding slide which is located on the supporting board, beside said active area; the automotive light being characterised in that at least one of said supporting brackets engages onto a corresponding fastening pin that protrudes cantilevered inside said rear casing parallel to a predetermined mounting direction (d); and in that said oblique guiding slide is substantially parallel to said mounting direction (d), 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 along said mounting direction (d). 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 light-guide bar being suspended/supported inside the rear casing by one or more supporting brackets which jut out cantilevered from the light-guide bar and rest on the rear casing; the light source additionally comprising an oblique guiding slide which is located on the supporting board, beside said active area; the automotive light being characterised in that at least one of said supporting brackets engages onto a corresponding fastening pin that protrudes cantilevered inside said rear casing parallel to a predetermined mounting direction (d); and in that said oblique guiding slide is substantially parallel to said mounting direction (d), 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 along said mounting direction (d).