spectral radiance (for a wavelength interval dl, in a given direction at a given point) [Lλ]

quotient of the spectral radiant power, dΦλ(λ), passing through an infinitely small area enclosing that point and propagating within the solid angle, dΩ, in the given direction, to the product of the wavelength interval, dλ, and the area of a section of that beam on a plane perpendicular to this direction (dA cosΘ) containing the given point and to the solid angle, dΩ


Unit: W·m-2·nm-1·sr-1

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