Well, yes... kinda. A friend of mine has a Fulton, and wanted it converted to LED. But the thing completely lacks thermal pathways (apart from the aluminium reflector, which is surrounded by plastic and therefore no help at all). My idea would have been: find someone with a lathe, have him turn a aluminium-dropin the size of the reflector with a hole in the front for one low driven XP-G and a fitting polymer optic. But finding a 3 V driver is hard, getting the setup even remotely watertight is even harder...
So I did a cheap-ass mod that can't be considered a mod really. I just popped in one of these:
It has a LED of unknown make, very strange dome that is supposed to work with all kinds of reflectors, and comes with its own 1-9V buck/boost driver. Don't know if it's thermally regulated, i tested one of these at 4.8V (4 eneloops) and it did get quite warm... 55°C or so, but stable over 10 minutes. Light output is okay, definitely better than original, but nothing spectacular. Beam shape stays rather ugly.
Unfortunately the manufacturer is in Germany, so probably not an option for you as they don't ship overseas.
If you want I can forward you one at cost, but shipping things from Germany is rather expensive. PM me if you are interested.
Hopefully someone else has a better mod for this light, these are very cool!
EDIT: Lots and lots of typos. Stup'id figners!1