Sorry for the wait. I recognize this one. It looks like the Ormalight adaptor that I have.
I am certainly interested though. With the spare lamp, do you mean the lamp that came with it in the package? Or do you mean an extra one?
I noticed that the adaptor has a B22 base. Just so you know, the Sylvania Lynx-Diamant adaptors that I have, have a E27 base.
In case you only have B22 sockets, this adaptor may be interesting:
http://dx.com/p/37167.