Abstract: A rectifier housing including a plug end and a receptacle end for interconnecting a line cord from a single incandescent light bulb as well as from a plurality of incandescent light bulbs with an electric wall outlet or with the receptacle end of an extension cord. A rectifier element in the form of a diode is positioned within the housing and is in electrical contact with one of the blades of the plug and one of the blade-receiving slots of the receptacle to provide rectified power to a single filament electric lamp, a multiple filament electric lamp, or a plurality of single filament electric lamps. The housing can be provided with a plurality of receptacles, one or more of which can be connected through a rectifier to provide rectified power from respective ones of the receptacles.