Yes, I saw it. There were a lot of them retrofit into a national chain store that we used to do maintenance work for.
Can't say if it was Halo, or a spin-off brand
One had a LV xfr on a screwshell that you screwed into the can socket, and then put a MR-16 in the LV socket.
Can't say if it had a UL sticker; it was about 2-3 years back. (Probably a asian import)