Running board light

A light assembly having a housing and an opening into an interior recess in the housing and a cover for covering the opening into the recess. The bottom wall of the recess has a lens construction integrally formed therein, such as by making the housing, particularly the bottom wall thereof, transparent to light. The inside wall surface of the cover has a U-shaped reflector mounted thereon, which U-shaped reflector has plural light bulbs spaced along the length thereof. The U-shaped reflector opens outwardly in a direction so as to face the transparent portion of the bottom wall of the recess. A labyrinth seal formed solely by the material of the housing and the material of the cover encircles the opening into the recess so as to make it unnecessary to provide a separate seal or gasket-like member.