Abstract: A vehicle headlamp has a sealed optical unit comprising a front lens, a reflector having a rear opening, and a transparent cup-shaped pocket fitted in the rear opening of the reflector. The cup-shaped pocket projects forwards into the space between the reflector and the front lens, so that light rays from a light bulb mounted within the pocket can reach the reflecting surface of the reflector, but the reflecting surface of the reflector is nonetheless inaccessible to contaminants from outside the headlamp. The lower part of the reflector should not reflect light rays from the light bulb, or at least from a dipped-beam filament of the light bulb, in order to avoid unwanted upwardly-directed rays being produced by the headlamp.