Rhino Directional light Falloff


I have a question regarding the Rhino Directional Light Falloff. Since the location of the light does not matter, what is the purpose of the Linear and Inverse Squared Falloff options?
I see that there are differences between Constant and Linear/Inverse Squared Falloff in Rendered and Raytraced view:

Thank you in advance!

Kind regards,

As I understand it, the Sun and other “directional” lights ignore the fall off option.