ZBrushCentral

Soft falloff for spot and point lights, how?

I am trying to place a light with a soft falloff in my picture. Unfortunateley i am not getting what i want and the edge of the lit area is always hard and looks as like cut with a knife. I used spot and point lights. Any idea how i may get what i want?
Best Regards
Heiner

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The_Cave_on_Ice_Mountain_V5_reduced_4_Rendertesting.jpg