What happened in the 1880s?
π Invention of the Photometer (1889): Advancements in optical science and light measurement.
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Further Reading
The Evolution of the Photometer - Solarlight (solarlight.com)
VISUAL PHOTOMETRY IN THE EARLY 19TH CENTURY (callutheran.edu)
A light history of photometry: from Hipparchus to the Hubble Space ... (harvard.edu)
Making light work: Practices and practitioners of photometry (philpapers.org)
History of research on light | Nature of light - Photon terrace (photonterrace.net)
Timeline - Pioneers in Optics - Molecular Expressions (fsu.edu)
TWO REVOLUTIONARY OPTICAL TECHNOLOGIES - Nobel Prize (nobelprize.org)