18650 size flashlight with 5 to 8min @1000lumens

Yeah the Sofirns drop at 3 minutes. I have a run graph of the SP31 here:

You can manually bump it back up but I didn’t graph for that. But it could do the 5-8min you are describing handheld without getting excessively hot. I walked with it in approx 75F (24C) weather.