This might not be what you want to hear, but here we go...
It's not a "bulb," it's an LED module.
If you know anything about electronics/LEDs/flashlights, it's probably a 30 minute fix.
If you don't, just asked somebody to fix it for you if you're really attached to the light.
An adept tweeker can remove the 'star' which the LED sits on, remove the wires if there's a driver board, place the star on a hot plate and disconnect the LED from the star, reflow a new LED with the proper electronic specs, back onto the star, reconnect the star to the driver wires and be good to go.
The hardest part is figuring out what cheap *** LED the light uses and then what the driver accommodates. XP-E, XP-G, some poop assed Chinese knockoff?
Too much work for me.
Ask around here, or on BLF, but I don't know if it's worth it?
Chris