Standard Fluorescent Medium Bi-Pin Base Socket Slide-In (FE1226-SW) This socket option can serve as a replacement for an old socket or help you finish a new lighting project. UL listed, this socket is intended for use with fluorescent T8, T10, and T12 medium bipin (G13) lamp tubes, and has a bipin (G13) base. This socket is stationary and has a 7/8″ mounting height, with a voltage range of 120 to 277 and a max wattage of 660W.