Abstract: The technical result of the invention is the creation of a moisture-proof LED luminaire, with improved cooling of optical assemblies with LEDs and of a power source as a result of the optical assemblies with LEDs being fastened to a body so as to be in thermal contact therewith, and the power source being fastened in the cavity of a cover so as to be in thermal contact with the cover. The body and the cover are interconnected so that air gaps are formed therein by end caps having through ventilation openings. The air gaps communicate with the cavity of the cover. The through ventilation openings communicate with the cavity of the body and the cavity of the cover and are designed to permit the passage of convection currents of air into the cavity of the body and the cavity of the cover, thus enabling more effective cooling of the body and the cover.