Won't be easy, unfortunately, I totally destroyed one to check out what kind of driver it uses. It uses firmware-defined boost-buck converter, however. I just retired another one due to Cree XR-E LED losing much of its original brightness. I may attempt emitter swap at some point.
Why is it hard? Thread lock in the retaining ring holding in pill stuck, and special hard-cure glue in most of spot in the pills, entombing the driver solid in place. It's possible to loosen things up however, unfortunately it means being a friend with heat gun. Wear the heat glove while doing this. If you succeed, I will spare you some headache - the MCPCB is about 10 - 14mm round in diameter (14mm Cree XP-L Sinkpad would work), if I am wrong, make it 16mm - compare Cree MCPCB with the original one. Also, Lens is PMMA or Lexan, if I remember correctly - so for some folks, it's desirable to change to glass lens.
