Fog lamp

A fog lamp for a motor vehicle, comprising a reflector, a transparent pane connected to said reflector, and an incandescent lamp accommodated in said reflector, said reflector having an upper portion and a lower portion separated from each other by a horizontal central plane, said lower portion being formed by a portion of paraboloid, said upper portion constituting a reflection surface which has every vertical section formed by ellipse and every horizontal section formed by parabola, wherein focuses of the paraboloid, parabola and ellipse are identical and form a focus of said reflector, said incandescent lamp being positioned in the region of said focus and being cylindrical and having an axis which is horizontal and extends at right angles to an optical axis of the fog lamp, said focus lying within said incandescent lamp, whereby a rough light beam with a concentrated core for a required light-dark limit is obtained.