A lamp system, especially for a motor vehicle, has a casing that is covered by a clear, optically neutral lens and that contains at least one light source composed of a light bulb and an associated reflector. A screen in the form of a semireflecting mirror is positioned between the lens and the light source in such a way as to separate a posterior lamp section that accommodates the light source from an anterior lamp section defined by the screen and the lens. Consequently, to an observer looking in the direction of the light source, the posterior lamp section is indiscernible while the screen is transparent to the light emitted by the light bulb when the lamp is turned on.