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photometry
luminous flux transmitted through an aperture


ratio of luminous flux from a cylindrical lambertian source through a rectangular angular aperture


Caution
Fill in all input cells.
Choose all parameters unit.
All parameters are positive.
It is assumed that the light source axis is oriented vertically and that its length l is much larger than its diameter.

InputValueunit
l
r
L
beta
teta
OutputValueUnit
Pto be calculated
Tto be calculated
ratio of luminous flux from a cylindrical lambertian source through a rectangular angular aperture
l : length of the light source r : radius of the light source L : radiance of the light source beta : half of the aperture angle in the vertical plane teta : half of the aperture angle in the horizontal plane P : luminous flux transmitted through the aperture T : ratio of luminous flux transmitted through the aperture

Note
This calculation page can not detect all unrealistic inputs.



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