light 

https://doi.org/10.1351/goldbook.08264
Electromagnetic radiation visible to the human eye.
Note:
In general, spectroscopic usage, 'light' is synonymous with 'radiation' when the specific wavelength is not relevant.
Source:
PAC, 2021, 93, 647. (Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)) on page 665 [Terms] [Paper]
Citation: 'light' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.08264 RIS BibTex EndNote
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