Flashing Lights?

Alright DBD friends and foes, i have a question for y'all.

At the start of the game, there's a flashing light warning, we've all seen it, we know its there.

However, i have a friend who wants to play DBD but is worried about the flashing lights. As someone who has played plenty of the game, I've never saw much of an issue with them, so I thought I'd go to reddit and see what YALL think the worst flashing lights in the game are, at least from a survivor standpoint.

I told them the Doctor might be a bit of an issue. Maybe flashbangs or blast mines if they're close enough. Flashlights if they played killer, but it sounds like they mainly just want to play survivor.

So i turn to yall, what are the worst/biggest flashing lights in the game that someone should be concerned about?