Brightness value in LR

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Harry Briels

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Aug 24, 2011
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Keerbergen, Belgium
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6.x
I would like to understand the importance of the "brightness value" information presented in LR Library Exif data.
It must be there to serve a purpose?
 
This is the value of the Exif field "Brightness" or "BrightnessValue". It represents the camera's assessment of scene brightness in APEX units. There's a very brief explanation in Appendix C of the Exif 2.3 specification.

Thank you Mark for your information.
However I would like to understand what I as a photo amateur, can do with this information?
There must be a purpose for listing this brightness value in the Exif data?
 
One of the examples given in the Exif specification is that you can tell whether the photo was shot in darkness, and therefore look for noise that you might wish to correct in post. But you can tell that yourself from the ISO/aperture/exposure time triad, so I'm not sure it's of any real additional value.
 
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