[miro]

Cat’s eyes are caused by mechanical vignetting, which is unavoidable with large aperture lenses consisting of more than 1 element fitted to some sort of barrel

Optical vignetting is caused by the unavoidable light fall-off due to light rays falling in at an angle in the image projection by a lens, the cos^4 rule.

Kind regards, Wim

Thank you for the explanation Wim. I was aware only for one type of vignetting
https://photographylife.com/what-is-vignetting
@ Klaus - Are this light dimmable. If yes - well-known Led manufacture gives the flickering factor