Luminous intensity

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Science and technology

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What Wikipedia says

In photometry, luminous intensity is a measure of the wavelength-weighted power emitted by a light source in a particular direction per unit solid angle, based on the luminosity function, a standardized model of the sensitivity of the human eye. The SI unit of luminous intensity is the candela (cd), an SI base unit.

Excerpt from the Wikipedia article “Luminous intensity”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Christian Pelant, Attribution, via Wikimedia Commons.