I'm not seeing a source for that figure, or even whether it's F or C. https://apps.dtic.mil/sti/pdfs/ADA238154.pdf https://apps.dtic.mil/sti/pdfs/ADA238154.pdf

I'm not seeing a source for that figure, or even whether it's F or C. https://apps.dtic.mil/sti/pdfs/ADA238154.pdf https://apps.dtic.mil/sti/pdfs/ADA238154.pdf (pdf link) says that lithium burning in air reaches a maximum temperature of about 1,000 C (about 1,800 F). https://www.thoughtco.com/flame-temperatures-table-607307 https://www.thoughtco.com/flame-temperatures-table-607307 says that various hydrocarbons (butane, candles, ethane, methane) produce pretty much the same temperature range when burned in air.