Kentucky game endzone screens

Did anyone else notice during the game that as we were moving the ball down the field say on 3rd down, they would make those large screens that were mounted on the walls flash blue and white really fast? Idk how that’s not illegal but as a fan it tick’s me off bad. When did college football come to this?Florida did the same thing a few years back during that game when the fog rolled in. I hate this crap