luminous intensity
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AI overview
Luminous intensity measures how bright a light source appears when you look at it from a particular direction, calculated by dividing the total light output by the solid angle (the size of the area you're viewing it from). It matters because it helps us understand and compare how bright different light sources actually are to our eyes, which is useful for everything from designing lighting systems to choosing lightbulbs.
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Article
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.
Measurement