On 8 August 1988, the Chicago Cubs played their first night game at Wrigley Field. The Tribune rounds up memories from people who supported and opposed the installation of lights at the park:
Ryne Sandberg, Cubs second baseman, 1982-1997: Leading up to ’88, the talk within the organization was that lights were necessary to create a schedule more conducive to resting the home team, getting us out of the sun. Before that, with some of those 10-day homestands with all day games (it was) in 90-plus temperatures.
Rick Sutcliffe, Cubs pitcher, 1984-1991: There's nothing better than playing a day game and going home to have dinner with your family. But when you come back from a West Coast trip, and let’s say you had a long game … sometimes we went straight from the airport to the ballpark. It’s really difficult that whole homestand. You just feel wiped out. … I would throw nine innings at Dodger Stadium and might lose anywhere from 2 to 4 pounds. There were times at Wrigley Field during that heat that I lost 10 to 15 pounds. I would love to go start a game to lose 15 right now!
Did lights help the Cubs? Probably; but there's no definitive way to say.