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In physics, the term "light" may refer more broadly to electromagnetic radiation of any wavelength, whether visible or not.[4][5] In this sense, gamma rays, X-rays, microwaves and radio waves are also light.Gamma radiation isn’t light, at least I don’t think it is. Gamma radiation and visible light are both electromagnetic waves but they’re both completely separate on the spectrum.
Gamma rays are essentially shorter wavelength and thus higher energy than visible light.