Here's a easy strait drop in mod for your FULTON flash light from regular bulb to a 6 led with no modification to the fulton light.
I picked up a 6 led flash light from the dollar store for a 1$ as seen in pic.
I simply pried out the lens of the dollar store light to get at the 6 led unit and gave the spring a stretch to reach the rear contact and a peace of tape around the spring to insulate it from grounding out then drop the led unit into the reflector and reassemble.
The inner clear lens of the fulton keeps the led unit in place so no glue or anything you can simply swap out the led unit to the regular bulb at any time.
Reason why I came up with this mod is in the winter the cold would kill my regular bulb's.
Comments are welcome