The Dallerton patio sconce is influenced by European from the ball-shaped cage to the warm amber glass the perfect addition to an outdoor entrance. Finished in matte black and solid cast aluminum for outdoor durability. This sconce requires one A19, 40 Watt bulb that can be placed on a dimmer. The back plate measures 4.25 x 8 inches. UL Rated for outdoor use. Professional installation by an electrician is recommended.