Gas operated underwater lamp

A gas operated underwater lamp which comprises a watertight housing having a frontal opening, a translucent cover disposed across said opening and covering same, said cover being connected to the housing in watertight sealed relationship therewith, at least one gas burning incandescent mantle disposed within said housing, first conduit means extending into said housing and communicating with said mantle to supply gas thereto for burning thereby, second conduit means extending into said housing and communicating therewith to vent therefrom products of combustion resulting from the burning of said gas, said housing and cover having heat transfer surfaces which cooperate with said mantle to prevent accumulation within the housing of condensate from products of combustion, when said housing is submersed in a cooling liquid, said housing having a top, a bottom and at least one side wall, said bottom of the housing, each side wall of the housing and said cover having respective coefficients of heat transfer all of which are less than the coefficient of heat transfer of the top of the housing whereby when the lamp is in operation, the top of the housing is cooler than said cover and other portions of the housing.