So is there any research on actual corona size for a light?

umm… what is ‘light corona’? Even google did not answer me.

Searching in google in spanish gave me this, but not directly, so still not sure -

It could be this -
https://en.wikipedia.org/wiki/Corona_(optical_phenomenon)

Interesting. Never seen such thing. Wonder if this only happens to camera lenses or human eyes too.

Some years ago (early PS4 era), a company showed a nice realtime demo of a orange robot in something like books library environment,
I can not remember the name of the company. They make middleware for game postprocessing fillters.
On their site, they had a very detailed research paper about such lens effects, IIRC.

Oh, found it, just not the paper: https://www.siliconstudio.co.jp/middleware/yebis/en/​

Edit: Slides here (not sure if it's helpful): https://www.siliconstudio.co.jp/en/rd/presentations/

JoeJ said:
Interesting. Never seen such thing. Wonder if this only happens to camera lenses or human eyes too.

https://en.wikipedia.org/wiki/Lens_flare#Manifestation

This is in case of the first effect. In case of the second effect, in order to see it, if you lack the access to a fog right now, it is said it can be observed through wet(fogged) glasses.

The Yebis ON vs Yebis OFF part of the video looks awesome.

Yeah its this

https://en.wikipedia.org/wiki/​Corona_(optical_phenomenon)