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Questions tagged [lumen]

A lumen is a measurement of the brightness of a bulb, LED, torch or any other light emitting device. Use this tag to tag questions about the the use of lumens on light emitting items such as head torches, etc.

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How bright a flashlight would I realistically need for searching through terrain?

Modern flashlights have brightness up to several thousand lumens which is great. However it's not clear how bright a flashlight I might realistically need. Suppose I want to go on a search party such ...