I believe she's talking about these:
https://pinside.com/pinball/market/shops/1032-lighted-pinball-mods/00933-the-addams-family-taf-colored-led-speaker-panel-ultimate
TBH I've never seen or used one. I'm sure its a quality product. Not a mod I'd be interested in on any game myself though. Seems like just a way to create even more glare on your playfield glass. If you think its a cool mod, then just do it, I don't think you'll end up buying junk, they are a pretty trusted vendor