Lampshade diameter 40 cm lamp base diameter 30 on and off: with built-in dimmer switch floor lamp requires 1 light bulbs (socket: e-27) all types of light sources e27 porcelain lamp socket can be used (led, energy-saving lamps, etc.). the luminaire has been rewired according to current safety standards and can be used in the usa and all other countries around the world. european plug (up to 250v).the wiring of this item may be original and might need replacement, if not specified otherwise.