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Light or visible light is electromagnetic radiation within the portion of the electromagnetic spectrum that is perceived by the human eye. Wikipedia

https://ourworldindata.org/light
@article{owidlight,
author = {Max Roser},
title = {Light at Night},
journal = {Our World in Data},
year = {2013},
note = {https://ourworldindata.org/light}
}
Max Roser (2013) - "Light at Night". Published online at OurWorldInData.org. Retrieved from: 'https://ourworldindata.org/light' [Online Resource]