I have not used the light long enough to figure out how many hours it will run. I only use the high power mode and have not figured out how to get to the low power mode. Over all it is a great flashlight for the money!
Pros: This light is well built at a great price. There is small lever that prevents inadverdent light activation.
Cons: It takes too much dexterity to use the "Strobe function". If you think you will use the strobe to disorient an assalant you wont be able to under stress with it's hair trigger..
This review was written in the old system and had content requirements that are different than reviews written today.