This isn’t as relevant as it once was, plenty of inexpensive lights available now where this isn’t a concern, the XM-L isn’t even used that much any more.
Unfortunately Lexel isn’t on BLF anymore, this was mostly about flashing his drivers, and while there is some generzl information about flashing, more recent, updated topic might be pinned instead, like Luxad topic : Anduril Flashlight Reflash Reference
Outdated, dead link.
A bit old, broken pictures, there are more recent topics with this info and recent LEDs.
Dead links, low res pictures
Two pinned topics with the same purpose, first one is old with few posts, should be unpinned and linked in the second more active one.
Outdated, this is a more recent list of available drivers : List of drivers
Dead link, then it looks like it was a work in progress that stalled (I only glanced quickly).