MLA Citation: Bloomfield, Louis A. "Question 388"
How Everything Works 20 Jan 2018. 20 Jan 2018 <http://howeverythingworks.org/print1.php?QNum=388>.
388. Where does the extra energy go after ultraviolet light goes through the phosphor coating? Is it lost as heat?
Yes. The extra energy is converted into heat by the phosphors. Their electrons absorb the light energy, convert some of that energy into heat, and then reemit the light. Since the new light contains less energy per particle (per photon) than the old light, it appears as visible rather than ultraviolet light.

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