The TK60 800-Lumens Flashlight (Black) from Fenix Flashlight is a waterproof flashlight with runtimes that vary from 4.25 to 400 hours, depending on the output used. This supremely bright light is made from aircraft-grade aluminum in a premium type III hard anodized anti-abrasive finish. Six output levels in two modes can be accessed by the dual side buttons. There are 4 constant light levels from 10 to 800 lumens, and 2 flashing modes--a strobe mode at 800 lumens, and an SOS signal at 111 lumens.
The output is digitally regulated to maintain constant brightness, and there's reverse polarity protection to protect against improper battery installation. The TK35 operates on 4x "D" batteries. The LED lamp has an approximate life of 50,000 hours. All of this in a flashlight that weighs only 14.35 oz (4076 g)!
Cree XM-L (T6) LED with a lifespan of 50,000 hours
Two modes, six brightness levels, and intelligent memory circuit