Most Efficient longest run time 18650 &21700 lights

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xxo
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Most Efficient longest run time 18650 &21700 lights

What are the 18650 and 21700 lights with the the longest verified run times at around 300 lumens?

Links to tests with run time graphs would be much appreciated.

Thanks!

Catnap
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Convoys switching drivers are generally pretty efficient. For example, M21E produces 370 steady lumens for over 6 hours.

Thanks to zeroair for the great graphs and reviews.

raccoon city
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Nice!

And if you use a 5000mAh 21700 10A cell, you'll probably get an even longer runtime.