Leaving, arriving, or transmitted luminous flux in a direction divided by surface area {luminance}. Constant times sum over frequencies of spectral radiant energy times long-wavelength-cone and short-wavelength-cone spectral-sensitivity function [Autrum, 1979] [Segall et al., 1966]. Luminance relates to brightness. Lateral-geniculate-nucleus magnocellular-cell layers {luminance channel, LGN} measure luminance. Light power (radiance) and energy differ at different frequencies {spectral power distribution}, typically in 31 ranges 10 nm wide between 400 nm and 700 nm.
Light {luminous flux} can shine with a spectrum of wavelengths.
Light sources {illuminant} shine light on observed surfaces.
Light {radiant flux} can emit or reflect with a spectrum of wavelengths.
Radiant flux in a direction divided by surface area {radiance}.
Radiant flux divided by surface area {irradiance}.
1-Consciousness-Sense-Vision-Physiology-Intensity
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Date Modified: 2022.0225