There is provided a lamp comprising a light source, a horizontal double ellipsoidal reflector composed of two reflecting surface units joined horizontally in opposing relation to each other and each formed from a spheroid, and aspheric lenses. Each of the two reflecting surface units is formed by cutting, radially around the center axis of the light source, a portion from the spheroid having a first focal point located on the center axis and adjacent the light source and a second focal point located on a line passing through the first focal point and tilted appropriately from the light-source center axis such that the cut portion spans, around the center axis, a range of 5.degree. to 9.degree. in either vertical direction from a horizontal line. The aspheric lenses are provided horizontally to correspond to the respective second focal points of the reflecting surface units of the ellipsoidal reflector and converge reflected light beams from the respective reflecting surface units. It is also possible to provide a horizontal triple ellipsoidal reflector further comprising a central reflecting surface unit formed from a spheroid and located at the center portion thereof in addition to the two reflecting surface units each formed of a cut portion spanning a range of 5.degree. to 6.degree. around the center axis.