to be completely correct, You are not using a "Cree R2" led, but a led from Cree in the output class "R2", the model itself is critical for an upgrade
(I would think it will be an XR-E)
as to "upgrading" ... one can swap led to newer versions, but in reality there wont be much
seeable difference, if there is no real difference in the led.
Say upgrading from a Luxeon to a Cree XR-E, maybe also from an XR-E to the newest XP-G/XM-L, that could be some difference.
But there the construction based specialities of the led itself might make much more difference, than the increased output might be.
At least its some project to start modding.
;)
in "beyond flashlights" - Led sub forum, there is the 1st thread, made sticky.
In there this thread might give some info, at least on the led models:
http://www.candlepowerforums.com/vb/showthread.php?270419-Commonly-Used-LED-Emitter-Index
