Please forgive me if I am missing the point, but with a bi-pin (at least with the Brilliance unit), the light case is 360-degrees from the doides. Do you mean something to use in a fixture where the socket is mounted at the back of the fixture and not on the side?
If so, Brilliance has a new unit coming out that may be what you are looking for. Details soon.
If not, please clarify what you were saying.