Most headlamps auto-regulate lumens to conserve battery life, quietly dimming over time as your eye adjusts to darkness. Tested during multi-day climbing trips across Utah. Despite the battery's size, however, it remains relatively light.If you need lots of light, and for longer (think, 50+ mile runs through the night) the 750 has pass-through charging and a run-forever cable, which can connect to an external battery pack in your vest so YOU can keep charging alllll night long.” The (USB-rechargeable) battery on this thing is quite-literally its biggest feature it can run up to 150 hours on low (5 lumens) or 7 hours on high (500 lumens) with a 750 lumen burst mode for when making those critical route-finding decisions. And its beam casts far and wide, giving the confidence and ability to route-find when the sun is no longer out to play though you still are. But not anymore.HeadLamp 750-which pumps out as many lumens as its name implies. “When tackling technical objectives, oftentimes route-finding on approach in the dark to get to the start can be the crux of the mission and I oftentimes find myself wishing for more lumens and more range out of my headlamp. Tested while free-soloing the North Arete of Matterhorn Peak the East Gully of Mount Laurel the North Ridge of Mount Conness in the Sierras. HeadLamp 750 In Action: What Beta Testers Are Saying It allows extreme extended battery life by allowing for a connection, via the included 3ft ‘run-forever’ usb cable, to a portable power bank, like the one you may already use for your smart phone, for example."
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