radiant energy

noun Physics.

energy transmitted in wave motion, especially electromagnetic wave motion.

light¹ (def. 2a).

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Origin:
1910–15

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Radiant energy is always a great word to know.

So is joule. Does it mean:

light waves or particles, the band of colors produced when sunlight passes through a prism, comprising red, orange, yellow, green, blue, indigo, and violet

a unit of energy, the work done by a force of one newton when its point of application moves through a distance of one meter in the direction of the force

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Collins

World English Dictionary

radiant energy

—n
	*Q_e* energy that is emitted or propagated in the form of particles or electromagnetic radiation. It is measured in joules

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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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.

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"As the brain of man is the speck of dust in the universe that thinks, so the leaves—the fern and the needled pine and the latticed frond and the seaweed ribbon—perceive the light in a fundamental and constructive sense. The flowers looking in from the walled garden through my window do not, it is true, see me. But their leaves see the light, as my eyes can never do. They take it, as it forever spills away radiant into space in a golden waste, to a primal purpose. They impound its stellar energy, and with that force they make life out of the elements. They breathe upon the dust, and it is a rose. Say that this is done with neither thought nor passion, and by something other than will. True that a plant may not think; neither will the profoundest of men ever put forth a flower. Of the use and the beauty of flowering there can be no shade of doubt. It is a rare thought of which as much can be said."

-Donald Culross Peattie