This was mentioned on another post,
http://forums.caves.org/viewtopic.php?t=4484&highlight=
I have modded several lights this way. Its pretty bright, but as mentioned int heother thread, I'm not sure how long the bulb will last being overdirven as it is. Its a nice cheap way to get a small bright spotting light to point out formations in a cave. Buyt he batteries online, much cheaper, e-mail me if you want to know of some good sites.
tooleyg@cox.net. At Wal-Mart the batteries are about 2 for $10, so it would be $15 in batteries for this mod.