The Butterfly Bouquet Lamp Base & Shade uses a 40 watt bulb, maximum. The round base has a 5.5 inch diameter, and is 11.5 inches tall. The Uno fitter shade sits on the socket; is 8 inches wide at the top, 8 inches wide at the bottom, and is 7 inches high. It runs on standard 120V and has a 2-prong polarized plug. An energy efficient light bulb is included.