I had a hard time finding some NSN numbers and was surprised some manufacturers did not have one. I hope this helps.
If anyone has more to add please do so
Maglite
http://maglite.com/publicsafety_mil_nsn.asp
Surefire...
I have seen many LED's for the tle-5ex
1.k2
2.seoul
3.cree
4. k2 "flip chip"
but it seems everyone is advertising the cree . Has terralux gone back to the cree and if so is it a newer version?