radiant energy

noun Physics.
energy transmitted in wave motion, especially electromagnetic wave motion.
light1 ( def 2a ).


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World English Dictionary
radiant energy
Qe energy that is emitted or propagated in the form of particles or electromagnetic radiation. It is measured in joules

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American Heritage
Science Dictionary
radiant energy  
Energy in the form of waves, especially electromagnetic waves. Radio waves, x-rays, and visible light are all forms of radiant energy.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
And total harvested radiant energy efficiency should be better.
Most of the radiant energy from the sun is in the visible light form.
When the sun heats a roof, it's primarily the sun's radiant energy that makes
  the roof hot.
For example, in photosynthesis plants take in radiant energy from sunlight.
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