Abstract: In an illuminated regulating device for operating a ventilation arrangement or the like in a motor vehicle, in the vicinity of a regulating wheel (2, 3) rotatable about its axis are provided several light outlets (13b, 14b) arranged stationarily and at the circumference of the regulating wheel is provided a movable light outlet (11a, 12a). The light outlets (11a, 12a, 13b, 14b) are formed by inserts of clear, rigid plastic and are connected to a common light source (16, 17) by light conducting inserts (11, 12, 13, 14). All stationary light outlets (13b, 14b) are formed at the ends of arms (13a, 14a) of a single-piece light conducting insert (13, 14) with total internal reflection made of clear, rigid plastic, which extends from the light source (16, 17) to the light outlets (13b, 14b). This light conducting insert (13, 14) is provided with a lateral light outlet surface (13d, 14 d) in the region of the axis of rotation (A) of the regulating wheel (2, 3).