Lb Background luminance in cd/m², calculated from Eind/π with Eind as vertical indirect illumination at the observer's eye.
L average luminance in cd / m2 of the light-emitting surface of each light in the direction of the observer's eye.
ω Solid angle in steradian (sr) of the light-emitting surface of each light relative to the observer's eye.
p Postionsindex by Guth for each lamp, depending on their spatial deviation from the main line of sight.
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