A beam of light from the headlamp of a speeding locomotive ought to move faster—says common sense—than the beam from a stationary flashlight. It doesn't. And there's nothing anyone can do ...

A dimmer light won’t threaten to dazzle people or animals, while a narrower beam will be more focussed. Being able to alter your iPhone's flashlight beam has seriously snuck under the radar ...

efficiently turning a flow of electrons into a searing beam of light. Despite their efficiency, they can still put out a fair whack of heat. Thus, if you’re building a powerful flashlight like ...

It may be better to light a single candle than to curse the darkness, but that was before [RCTestflight] came up with this: a 1000W LED flashlight ... focuses the beam on a properly distributed ...

I started my test by comparing the beam patterns of each flashlight. I shined a target ... to see objects beyond those obstacles, whereas a light lacking the necessary throw will hit pitter ...

A lumen is a unit of measurement for the intensity of the light coming out of a flashlight. The higher the lumens, the brighter the flashlight. I also spoke to survivalists, campers, and ...

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Enjoy a lightweight, ~0.78-ounce weight, dual mode high beam 90 lumen and soft 10 lumen, 1 and 6 hour runtime, 2 hour charge time, 15M/5M beam length, IPX6 water resistance, and rechargeable 10180 ...