A light assembly, particularly for a motor vehicle, essentially consists of a housing covered by a clear, optically inactive covering pane in which at least one light unit is arranged which is formed of a light with a pertaining reflector. The adjustable connection has first and second washers each rotatably supported by the fixation element and each having an angled contact surface in a plane not perpendicular to the longitudinal axis of the fixation element, with the connection location being between the bone entry portion and the first and second washers. Other arrangements are described. Features may be provided to ensure proper alignment and location of the joining arrangement. The energy source is either one of a microwave source and an infrared source.