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100% Texan Patriot. Lifelong seeker of truth. Love of God, family and the goodness of humanity, let it shine! 🌞
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Luminous intensity, the quantity of visible light that is emitted in unit time per unit solid angle. The unit for the quantity of light flowing from a source in any one second (the luminous power, or luminous flux) is called the lumen. The lumen is evaluated with reference to visual sensation.
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Several measures of light are commonly known as intensity:
Radiant intensity, a radiometric quantity measured in watts per steradian (W/sr)
Luminous intensity, a photometric quantity measured in lumens per steradian (lm/sr), or candela (cd)
Irradiance, a radiometric quantity, measured in watts per square meter (W/m2)
Intensity (physics), the name for irradiance used in other branches of physics (W/m2)
Radiance, commonly called "intensity" in astronomy and astrophysics (W·sr−1·m−2)
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