Welcome To Aomh! Geodude,
now for your question, When ever you create a lighting file, it goes straight to your data folder (c:/program files/microsoft games/age of mythology/data)
Just find the file called, somename.lgt file. rename it to change name of it.
As your new, i suggest you use the question thread which is stickied above if you want to lessen the amounts of spam people hate, Also check the vital resources around this website, for knowledge in AOM.
by the way, did you name yourself after a pokemon?
A green great dragon.