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]