Night baseball has been played at Wrigley Field since 1988, 34 seasons’ worth. That means you’d have to be at least in your early 40s to have any clear memory of Wrigley without lights.
As you surely know, the first scheduled Wrigley night game August 8, 1988 was rained out after three and a half innings and so the first official night game took place the next night against the Mets, the Cubs winning 6-4. There have been many postseason night games at Wrigley and the team hosted the 1990 All-Star Game, the latter awarded only after lights were approved.