How do I fix this shadow/lighting issue

Development Rendering
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1

Trying to wrap my head around some shadow/lighting issues. This fader knob looks like it’s dirty:

1045×468 310 KB

Here’s the blender UV:

1065×581 26.1 KB

2

Hi!

Lightmap… I guess the resolution is low too but the main problem is the uv… :S
You shoud have more padding and more separate islands! …this is why your shadow/light will bleed over other faces…