Since sub-reflectors are built on left and right of a longitudinal main reflector, respectively, a headlamp can be made compact longitudinally if viewed from the front. The alternator further comprises a rotor having a field coil positioned within the housing and a stator positioned within the housing. In accordance to one aspect of the present invention, a high spin rate golf ball with a dense center, which is positioned radially inside of the centroid radius, and a low specific gravity mantle is provided.