Large light source and shadow smoothness

Development Rendering
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1

How can I increase the number of ray cast from light source or some other kinds of sorcery and create smoother shadow angle? I’m aware about lightmass resolution in ground plane. My concern is about the shadow due to light source angle or large light source. I want smoother penumbra.

I have uploaded a second image for clarification.

Also, right now I’m only concerned with static light.

My sample scene:

http://puu.sh/ipqFx/ed9622be19.jpg

http://puu.sh/ipNye/dd23189638.jpg

2

I have edited my question for clarification. could you please take a look again?

3

have you played with attenuation radius, source radius, and min roughness?

4

Yes, I did.

5

Apparently, changing the Light Build Quality to Production fixed the problem. Thanks for your effort.

6

Changing the Light Build Quality to Production fixed the problem.