UltraFire UF-H3 LED swap?

I recently bought a UF-H3 and love it. My only complaint is I wish it was a little brighter at times. I was wondering if anyone has tried swapping the led, and if so how did it turn out? I have a spare XML laying around I would like to use.

Yes. In a UF-H2. Smaller brother.

http://www.forolinternas.com/viewtopic.php?f=10&t=3977

Tido did it with a H3, tho no XML but XPG:

Yep, I've seen the led swap done before. I'm still looking for a replacement driver for my UF-H2 before I replace my led. No luck so far.