The Remix should be your go-to when runtime is crucial. The Remix features an astounding 43 hour runtime on High, by far the best in its class. For preserving night vision, it also features a cluster of red LEDs for close at hand tasks.
Power: 450 Lumens

Runtime: 43 Hours
Batteries: 3 AAA Alkaline
Weight: 83 Grams
Water Resistant: IPX4