I have used many more expensive lights working on Aircraft in all sorts of conditions from Alaska to Africa. This is honestly better than all the name brands out there. Inexpensive, very bright, lasts a long time, rechargeable, and will use 18650 batteries. I use the Streamlight SL-B26 in several lights, it keeps things simple. The headband is comfortable, easily adjustable, and doesn't deteriorate with sweat. If you destroy or lose it working no big deal.
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