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Well you can do that with a combination of lighting changes and keyframes, or you can try the Old Movie FX:
Yeah I tried using old movie, I don't think there's any way to make the flicker brighter and darker. Like I mean how it flickers stays constant, I want it to grow really bright, then dark, then kind of bright, then dark. I could always hit split and make each image brighter but it doesn't give off a flashing effect, you know? Sorry this sounds extremely unclear, I just really don't know how to explain it lol. I'll give an example of what I preferred it to look like:
Go to this video and to the time stamp 10:01. See how it flashes there?
https://www.youtube.com/watch?v=bB9x7LwN2fk