- Radiant energy is the electromagnetic energy transported by electromagnetic waves.
- Radiant energy can also be described in terms of elementary particles called photons.
- Radiometric techniques characterize the distribution of the radiation’s power (transfer of energy per unit of time) in space.
- The symbol Qe is often used to denote radiant energy (“e” for “energetic”, to avoid confusion with photometric quantities).
- The SI unit of radiant energy is the joule (J).
- Whilst radiometry deals with electromagnetic radiation, photometry deals with the interaction of light with the human eye.
- Outside of the field of radiometry, electromagnetic energy is referred to using E or W. The term is used particularly when electromagnetic radiation is emitted by a source into the surrounding environment. This radiation may be visible or invisible to the human eye.
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