Or just stick a 18000 mcd Nichia or an LCK 26000mcd in it and run it off the lithium AAAs. All you have to do is trim the leads a little and get the polarity right.
The one I put together with an LCK on June 6th is still glowing after nearly four months of continuous operation. Not bright, but enough to read by if you hold it ~4 inches away.
Give you a hundred hours+ of useful life, better beam than the standard hotwire bulb and reflector.