Questions tagged [lumen]

The Lumen is a measurement of the intensity of light.

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What is the lowest level of luminous flux a camera can detect?

In the past, I've asked about taking photos of luciferase. Now I'm curious how weak of a light source I can detect. From How many photons per second is one Lumen? on Physics Stack Exchange, I can ...
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Recalculating lux or lm from EV [duplicate]

I have to calculate amount of light from IR emmiter. The only equipement, that I can use is Sekonic Light Meter like this one: http://www.ebay.com/bhp/sekonic-l-358 The problem is that i need to have ...