as a 10 year aircraft maintainer in the US Air Force , I have use everything from standard mag-lite , scuba diver ' light , and even penlight in a pinch . I can say this flashlight be brighter than any other I have use . it cut my inspection time in half because I can see thing 55 foot off the ground just like it be right in front of I . do not be fool to think a rechargeable battery pack be not as strong as standard alkaline battery . this be not the case . I would not trade this flashlight for anything !