It was not for the faint-of-heart. It took mucho modding.
I'm pretty sure he is talking about something similar, based on the Bosch reference. You could try this, but again, it will take quite a bit of modding: http://www.dealextreme.com/details.dx/sku.5862
And 350 lumens isn't that great for the wattage. You would probably be better off to just strap 3 x Crees in there on a large heatsink and direct drive them, since it will be more around 12V when fully charged (my 18V is up around 20V fully charged).