The histogram in Lightroom is divided into 5 parts. Understanding this will help you achieve the right exposure all the time.
The left-most is Blacks and make up 10% of the pixels of the entire image. The next part is Shadows and it make up 15% of the image. The third one is Exposure and it is 50%. The fourth one is Highlights which is again 15%. The last and the right-most part is Whites which makes the remaining 10%.
Let us take a look at the above photograph and its histogram. As we know, the first part is Blacks and in this photograph, Blacks are pretty much covering the upper part of the photograph. In general, it occupies so many pixels which is why, in the histogram, the majority pixels are showed in the Blacks region.
As we know shadows are little brighter than Blacks. The areas between the Bokehs comes under Shadows.
All brighter areas than Shadows will come under Exposure.
The fourth is Highlights. All the Bokehs will come under Highlights. These areas are brighter than Exposure.
The last portion is Whites which are brighter than the Highlights. In this photograph, only the lamp’s flame falls under Whites.
Lightroom is designed in such a way (which is very necessary) that if you adjust any particular slider, the changes will not only affect those particular pixels but also the neighboring pixels. So this will have a smooth effect.
Work on this and let us know, how it helped you in the comments section.