If you can remove what I believe to be a lens, I think you'll find
that the actual LED is rather conventional and can be found in the
Cree catalog.
http://www.cree.com/LED-Components-and-Modules/Products
If you sort the above list by power output, there are only 3ea 1w
LED's listed. Just find the right die size and good luck soldering
the tiny chip. You can also dig throught the current flashlight
offerings and see which 1w chips are popular.
[Jeff Lieberman]

I found these:

https://www.led-tech.de/en/0.5W-Power-LEDs_DB-86.pdf

Looks good, no?