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 ...

A CLEVER iPhone trick lets you change the shape of the beam of light from its built-in torch. Gadget fans have spotted the handy feature, which has only been out for a few months. You can use this ...

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 ...

If you want or need a hands-free light source ... but we've called it the "flashlight of your dreams". Its beam is super powerful, and it has multiple settings to choose between.

Featuring 450 lumens, the ThruNite Archer 2A V3x LED Flashlight has a powerful light beam that can illuminate up to 143 meters away. It has five lighting modes — firefly, low, medium ...

It has three light modes, including a white LED light, UV light and a green beam, so you can use this flashlight in a variety of situations. You’ll also appreciate the five-level battery ...