The lithium-powered Xenon bulb flashlights are a fire hazard if they activate inside a pocket, fanny pack, drawer, glovebox, etc. The heat generated by the bulb can ignite/melt some materials, especially those in contact. The lithium batteries do heat up if used constantly for 10-minutes or more and this may induce failure of the power cell.
I have a 100% polyester pullover that has a melted spot from forgetting a Surefire 6P in the back pocket while driving for about 5 minutes.
In the event of a Lithium battery fire avoid using water to extinguish the fire. Lithium gets very violently angry when exposed to water and the battery may explode all at once if the lithium compound is exposed by a ruptured case. Also, do not use CO2. Dry chem may work, but keep your distance and use it to contiain the fire. For Lithium fires, a Lith-X filled extinguisher or a Type-2 Class-D fire extinguisher with copper powder is recommended.