Technically, light is not formed by energy; it IS energy. The light we see is just a tiny fraction of the energy spectrum that runs all the way from very very short wavelengths (gamma rays and x-rays) thorough ultraviolet, visible (from violet to red) infrared, radio waves, etc. Here is a site that covers some of the same information.
http://en.wikipedia.org/wiki/Electromagnetic_spectrum
how is light formed by energy?
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