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I know what you're talking about but not sure if we have a page.
Related to Briffits and Squeans and Painting the Medium and also very similar looking to Hit Spark.
Edited by IronAnimation
I think OP is referring to something (similar) to this. Although it's not always electric looking.
This blog calls it "realization flash" (scroll down)
https://www.japanesewithanime.com/2020/03/realization-mark.html?m=1
A variation that you might be looking for is what he calls a "Beta flash"
https://www.japanesewithanime.com/2020/03/beta-flash.html?m=1
This could totally be a trope page.
Edited by IronAnimation
I think that's it, judging by the descriptions. It's not a 100% match, and I can't find any further information on the topic off-site (partially 'cause any other actually relevant results, if there are any, are completely buried under beta Flash content by search engines), but it's far closer than anything else I've seen in my searches.
You know, when either there's an intense staredown or someone suddenly realizes something and the background goes all dark and then there's a horizontal flash of light with a spark in the center, predominantly seen in anime and anime-inspired media? I've looked everywhere on this site for it, used every keyword I can think of, and no matter what I've tried, I can't seem to find it anywhere. Is there a page for that?