For traditional household bulbs, you can typically find screw-in bases, like the standard E26 medium base or the E12 base commonly used with candelabra bulbs. For miniature bulbs, they often use a bi-pin base or bayonet base. Bi-pin bases, like G4 or G9 bases, include two pins that push into the socket. The base type begins with the letter ‘G’ followed by the number of millimeters between each pin. For example, a G4 pin uses pins spaced 4 millimeters apart. A G9 uses pins spaced 9 millimeters apart. Envision also offers a 5W G9 bulb that uses a G9 looped base. You can also find single contact bayonet bases, sometimes called an SC bayonet base. A single contact bayonet base pushes into the socket, turns, and locks into place. They feature a single point of contact. You can also find miniature bulbs that use DC bayonet bases, also known as dual or double contact bayonet bases.