Uses four 40-watt max, E12 bulbs (not included). We recommend energy-saving LED bulbs. Canopy measures 4.75" diameter x 1" high. Hardwired; professional installation recommended. Mounting hardware included. Safety tested for use indoors and in dry locations that are not directly exposed to excessive moisture and water. In order to protect the delicate glass of this collection, some assembly upon delivery to your home will be required.