Technique on the light?

No.6024907 ViewReplyOriginalReport
Can anyone explain what they did on the lighting part with the blur? Is it a brush setting in csp, did they use a blur tool, or how did the achieve this affect?

here's the original vid https://twitter.com/Nardack/status/1508091994010435586?s=20&t=VyLKAvRdhwOPMReb-V97bg