General lightsabers are in /object/weapon/melee/sword/.
Crafted ones are in /object/weapon/melee/2h_sword/crafted_saber/ (as Lev said) and /object/weapon/melee/sword/crafted_saber/.
Grab those and handle them like you would any other.
If you don't know the .tre they're from, they're mostly from patch_04.tre, crafted ones are from patch_09.tre (for the most part).
There is also NGE swords, but you'll be able to find those if you had the NGE directory and opened the .toc file.