Firelight Lantern
The "Firelight" lantern contains over a hundred LEDs, a microcontroller, a battery pack, and custom software. The software in the lantern monitors the power level, and as the batteries slowly run down, the flames burn lower until they are reduced to softly glowing embers, which die out as the batteries die.

VIDEO: youtu.be/6iCFQRMn3k0
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