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I have the arrow with glowing shader. Rendered by cycles it looks like this:

Glowing arrow with strange light effect

You can see the light rectangles, I don't want there.
Geometry of the arrow looks fine:

Glowing arrow with strange light effect in edit mode

My shader:

Glowing shader for the arrow

The .blend file: https://pasteall.org/blend/ba4cd35ef4d54a5aaa8cad92cdae5c3f

So how can I get rid of theese light rectangles?

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It's the shape of your arrow that you can see by transparency as it is refracted by the Glass node. You can either lower down the IOR value or increase the Roughness of the node to try to decrease this effect. Also, the topology is rather bad but it's not the problem here.

enter image description here

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