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). <EOS>