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The page calculates the power from a circular lambertian source capted by and transmitted through a cylindrical light guide as functions of the source radiance and diameter, the source center position regarding the light guide entrance, the diameter, the length, the attenuation per length unit and the refraction index of the light guide.

The capted power comes from rays impacting the light guide entrance.

Note that the transmitted power includes the losses induced by Fresnel reflections on the light guide facets.