18 x XM-L Flashlight is in the town!! Someone has just up the game!!

LED Flashlights – General Info 26650 Flashlights
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Luckily Match posted quite an intensive data on this XML T6 LED.
assuming my calculations are correct with 0.77A at 3.7V, his test results are around 303.5 lumens for that current and voltage input.

Test on LEDs