Headlamp for power vehicles

A headlamp for a power vehicle, comprising a reflector having an apex;

• a light source arranged in said apex of said reflector;
• and a dimming device which is formed so that in a position for high beam it allows light from said light source to at least reach a lower reflector region, and in a position for low beam at least keeps away light from said light source from the lower reflector region, said light source being formed as a gas discharge lamp with an axial light arc, an upper reflector region being formed for producing a light distribution for a low beam while the lower reflector region being formed for producing a light distribution for high beam, said lower reflector region having a surface which in the region of the apex is defined by a paraboloid of revolution and which is deformed in a radial outer region to obtain an approximately rectangular light distribution for high beam.