A Mogul Base, also known as an E39 base, is a type of lamp base used in the lighting industry for larger-sized bulbs. It is characterized by its larger dimensions compared to standard lamp bases. Mogul Base bulbs have larger screw bases, typically measuring 39 millimeters in width, while standard medium screw base bulbs have bases measuring 26 millimeters in width (indicated by the E39 and E26 designations, respectively). Although mogul base bulbs cannot be used with standard medium screw base sockets (E26), adapters are available to convert a Mogul Base socket to accommodate a standard bulb, allowing for greater flexibility in lighting options.