First one that got me hooked was the Fenix P3D Q5. After that came a Fenix L2D Q5. Took both on a week long backpacking trip to the High Sierras with my younger brother, who was afraid of the dark at the time. Running these lights all night on low for 6 nights straight, I never changed the batteries once. I have managed to scare away a mountain lion from a campground with the P3D on turbo (on a different trip). These Fenix lights were a huge step up from the 3 watt l.e.d. Minimags.