This is posted in two different threads, because the two lights exchanged a bunch of parts...
I now have one with XML2 T6 3Bs on Sinkpads, one with 4Cs on Sinkpads, and this one with the 6x stuff, unknown cool white XML2s, copper-pinned 6-up MCPCB, and the kewl 'JB' driver. 8)