Screen brightness

Apr 11, 2013
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Your Mac's Specs
13" rMBP 2014, 8GB RAM, 128GB SSD, 2.6GHz i5
I am wondering, when you decrease the screen brightness, what each bar represents as a percentage decrease? I may not have worded that to the best of my ability so I'll try again.

When display brightness is at 100% (all bars) then the Mac will put out so many lumens (am I right?). When I reduce the screen brightness by 1 bar, the lumens will also decrease. I am trying to find out the percentage decrease for each bar.

I have no real need to know this, I would just like to know out of interest.

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