It looks like a try to make "powerball" style arctube with the standard multipart technology

A quote from James: "The most advanced are the single piece ellipsoidal type as used by Sylvania and a growing number of Philips types but these are also the most expensive. A cheaper method is the Osram Powerball style, also copied by Philips, having an ellipsoidal shape made from two pieces of ceramic sintered together around the centre point. GE’s design here is cheaper again and actually slightly better. It is still a 2-part ceramic but the interface is shifted off-centre to one side. This makes assembly very much easier and cheaper, and being asymmetric has the advantage that when used base up the thermal profile is actually better than an ellipsoidal arc tube, and performance can be slightly improved."

Love this wine glass shape