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- The rate of flow of electromagnetic energy, i.e., radiant energy. Note 1: Radiant power is usually expressed in watts, i.e., joules per second. Note 2: The modifier is often dropped and "power" is used to mean "radiant power". Deprecated synonyms flux, radiant flux.
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- aperture, radiant emittance, radiant energy, radiant intensity, responsivity, shielding effectiveness, threshold frequency