Static Lighting Banding Artifact

Development Rendering
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1

Using static lights with very close objects somehow leads to occlusion banding effect or something.

It is how static lighting looks

http://s12.postimg.org/ltg27avrh/Capture.png

http://s12.postimg.org/ltg27avrh/Capture.png

It is how dynamic lighting looks and static lighting supposed to look like

http://s12.postimg.org/u95mosyml/image.png

http://s12.postimg.org/u95mosyml/image.png

Just to be sure I unchecked Ambient Occlusion on Post Processing, built light with production quality, bumped up lightmap resolution to 256 and even changed indirect intensity to 0.0.

2

if anyone is interested, this is the mesh.
https://www.mediafire.com/?4jjq8lhs63l4596

3

Setting “Static Lighting Level Scale” in World Properties lower like 0.1 solves this problem.