Leviton produces lamp holders for virtually every light source equipped with incandescent, fluorescent, or CFL lamps. Lamp holders include incandescent medium base, and specialty sizes and fluorescent lamp holders, in addition to a large line of porcelain lamp holders including pulse-rated mogul base products, and an extensive selection of devices for high intensity lamps. 660W/250V Medium Base One Piece White Urea Outlet Box Mount Incandescent Lampholder, Pull Chain, Single Circuit, Top Wired, White.