Great light. Durable, small, bright, not too many modes, and the zoom is a great feature.
During testing, the light emitted 82lm at the emitter, and 75lm-70lm out the front (depending on zoom, wider was slightly brighter). Test was performed with a new alkaline battery and a bench supply at 1.5v. This is still plenty bright for most usage. When zoomed in as far as it will go, the beam is visible at night.
The light is water resistant. Extended exposure to rain, and pouring water on it, showed no signs of water ingress. Submersion in 1ft of water showed some water behind the lens after a short time. From my own testing, this light meets IP55.