Zebralight headlamps, I have 5, is what I use to work on cars or buildings. In 10 or so years, they served me well without a single failure. It is the most compact, lightest and brightest 18650 that I am aware of with choice of different reflectors and LEDs for required beam profile, It is tough too: I dropped it in shafts, covered in mud, paint, banged around objects, left in wet conditions, etc. I absolutely destroyed a couple of g-shock watches, just by wearing them at work, the zebralights are still kicking. I almost want them one fail so I can have an excuse to buy another one.