How to decide a Window Size - (Window to Wall Ratio explained)

This video explains an old concept of designing a window for a room, in older times the study of light behavior was done by observing surroundings, but nowadays many green building analysis software is available to design room openings and see the impact. This Is also called Window to Wall Ratio or WWR for short.
This video shows how a window size can number can drastically change the look of a window.
The engineer has to utilize daylight as much as possible to make a room efficient. However, he needs to perform lux calculations for light during the night for energy-efficient room design.
There are software like Revit, Insight, and Green Building Studio that can perform calculations based on the actual location of your home on Google Maps.
Keywords:
Window to Wall Ratio, Lux Calculations, Insight Light Design , Revit Light Analysis.