Illuminant
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2-1-450
Radiant energy with a relative spectral distribution defined over the wavelength range that influences object colour perception.
Note: In English, this term is not restricted to this sense, but is a general term used for any kind of light falling on a body or scene, and is also used to refer to the light source itself, including its filters if any.
Reference: C.I.E.
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)
