GE Genura 23w self-ballasted induction lamps

I stumbled upon an almost complete case of these on Ebay (5 out of 6 lamps), these are really quite rare as they were at least £30 pounds when new! I got them cheap as the person selling them likely thought they were ordinary CFL lamps. These are of a slightly older design than the one Genura I already had. Unfortunately the 5th lamp appears to have been used and came in a box marked "faulty". However upon start-up it seemed to have no problem but perhaps problems would occur later in operation.