Lamp devices, apparatus, methods of use, and methods of assembly which can be used with a single suspension lamp and/or with a plurality of suspension lamps. Each lamp can have a lamp seat mounted on a tubular member that is fixed to a main body. The lamp seat can be connected electrically to a circuit unit housed in the main body, and is mounted with a lamp bulb. A bowl-shaped upper lamp shade surrounds the lamp seat, is mounted on the tubular member, and is formed with heat-dissipating holes. A lower lamp shade is coupled detachably to a larger-diameter lower open end of the upper lamp shade, and cooperates with the upper lamp shade to define an accommodating space for receiving an assembly of the lamp seat and the lamp bulb. A bowl-shaped water-resistant cover is mounted on the tubular member, and is disposed above the upper lamp shade for covering the upper lamp shade.