Hm. Well... it's actually, I would think, pretty simple, but damned if I can find what I need to know about it. It's basically a faint, streaky light effect, like you see in a lot of shows where they have flashbacks. I am trying to find something online I can reference to show people. The only options I have for light in FCP are spots and lens flares, and they don't allow me to make them vertical.

I don't have AE myself -- I only have Motion, which I have no idea how it is in comparison to AE.