How do you get 550 lumens from a 3.7" flashlight?

The recently released Fenix PD25 packs a powerful punch for such a small light.  Engineers found a way to fit a 16340 Lithium-Ion battery into the every day carry flashlight body, resulting in what may go down in history as the Ultimate EDC Light.  The Fenix PD25 also utilizes a CREE XP-L (V5) LED with a lifespan up to 50,000 hours (a 251% boost from the previous XT-G2 LED).

Check out the Fenix PD25 SPECIFICATIONS on the product page