Multiple Reflections Error

Development Programming & Scripting
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1

Hi,
There is a phenomenon where reflections occur multiple times in the lumen light.
Is there a way to get rid of that error??

I’m attaching the video and file, so please check it.

2

Attaching the video and file

https://drive.google.com/drive/folders/1O1raH2fPZ7Zhs1ls_ak0c5atLWyYuKaH?usp=sharing