I do not think there will be a LF2XT light again. The light engine is really complicated. I disassebled a few light engines for Emitter swap. The lightengine has 3 or 4 very small PCBs connected with very small wires.
When I remember correctly the electronics Guru of Steve Ku tried to create a LF2XT like light, but failed. Also if I have it correct in mind Steve Ku had the Option to get Liteflux or a license to make products with this Name, .... for a short time he also maintained the Liteflux Facebook page that does not exist anymore.