Okay, so you know how it absolutely sucks when you're exploring the polar icecaps and your flashlight craps out at sub-zero ...
Lumen is a measurement of light output emitted from a source, whereas lux is a measurement of illuminance, or the quantity of ...
When the first-ever flashlight was introduced to the world in 1899, it was big, bulky, and not very bright. Oh, what a ...
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