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photometry
light source with uniform radiance (lambertian)


intensity of a cylindrical light source


Caution
Fill in all cells except one.
Choose all parameters unit.
All parameters are positive.

ParameterValueunit
L
I
r
l
i
intensity of a cylindrical light source
L : radiance I : intensity r : radius of the light source l : length of the light source i : angle of observation

Note
This calculation page can not detect all unrealistic inputs.



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