The Light Score (transformation of mean z-score) is a metric in the High Resolution Electricity Access (HREA) dataset that quantifies changes in nighttime light intensity relative to the mean. It transforms the z-scores of visible radiance data to create a score reflecting the brightness of settlements. This metric is useful for tracking urban development and energy access over time, offering insights into the evolution of infrastructure and the anthropogenic impacts on the environment. The data is available annually from 2013 to 2020, derived from satellite observations using sources like HRSL and GHSL. Open Access