How to make smooth gradient in pointlight lightmapping

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Hi there,

I’m new to baking lighting in Unity.
I’m trying make a smooth gradient transition in the red area, but all the settings I have tried in [Bake] and [Object] tab of Lightmapping doesn’t have any meaningful effect.

Did I miss something or this require some advanced technic? Please explain to me, thank you.

This is silly of me, I will answer my own question.

The lightmapping was not smooth caused by compression, it’s was visual artifact. Go to [Maps] tab in lightmapping window, uncheck compression and things will smooth like hell.