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photometry
light source with uniform radiance (lambertian)


irradiance of a surface by a light source at infinity


Caution
Fill in all cells except one.
Choose all parameters unit.
It is assumed that teta is small.
All parameters are positive.

ParameterValueunit
L
i
teta
E
irradiance of a surface by a light source at infinity
L : radiance of the light source i : inclination of the surface teta : angular size of the light source E : irradiance of the surface

Note
This calculation page can not detect all unrealistic inputs.



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