LH0910 Converts a 4 pin CFL socket (except GX24q-5/q-6) to an E26/E27 medium base socket (ballast must be removed) ***Ballast MUST be removed to operate incandescent, halogen or LED lamp*** GX24 to medium base adapter coverts a GX24 4 pin CFL socket except GX24q-5/q-6 to an E26, E27 medium base socket In other words allows an E27/E26 medium base lamp to be used in a GX24 socket. Except GX24q-5 or q-6 bases