From The Greatest Minor League: A History of the Pacific Coast League, 1903-1957, by Dennis Snelling (McFarland, 2011), Kindle Loc. 2436-2453:
The concept of baseball played at night was nothing new; barnstorming teams had done so for years. There had been experiments with temporary lighting beginning in the late 1800s, including an exhibition held at Athletic Park in Los Angeles in 1893. In June 1927, two New England League teams played a seven-inning game at Lynn, Massachusetts, under temporary lights before several thousand people who were surprised at how well they could follow the action and noted that players seemed able to react quite well to the ball.
Lee Keyser, owner of the Des Moines Demons in the Western League, had attended a number of college and high school football games at night and was impressed with the quality of lighting at those events. Confident that a permanent set-up would work for baseball, he invested twenty thousand dollars to install 146 floodlights mounted atop a half-dozen ninety-foot-tall poles at the Demons’ stadium and then announced that Des Moines would open its 1930 home season on May 2 at night against Wichita. “If the game is successful … I look for most of the minor leagues to follow the example of Des Moines and install floodlights for night baseball,” said Keyser. “If it is unsuccessful, it will mean that sooner or later the minor league clubs will have to go out of business due to steady decrease in patronage.” Several major league executives made plans to attend the game and a national radio audience tuned in to the contest, which was carried by the National Broadcasting Company.
Twelve thousand fans crowded into the stadium, and while the game was a less-than-artistic Moines jumped out to a 12-0 lead after three general consensus was that the quality of baseball was as good as it would have been during the day. Problems remained to be solved, including dark spots along the foul lines, and a fielder lost one pop foul in the lights, but Lee Keyser was undeterred. He addressed the national radio audience between the sixth and seventh innings and declared, “My reaction to night baseball is that it is glorious and wonderful. The players are happy, the crowd perfectly satisfied, and it means that baseball in the minor leagues will now live.” The Chicago Tribune agreed with Keyser that night baseball might well be a “life saver” for the minor leagues.
Continuing to struggle in Sacramento, Lew Moreing took notice. He quickly ordered lights and had them installed. On the night of June 4, 1930, at precisely 8:31 P.M., Moreing flipped a switch, generating a buzz from forty banks of lights, each carrying a trio of sixty-thousand-watt bulbs. The lights slowly grew brighter, illuminating the playing field as hundreds of people in their automobiles, surrounding the stadium to witness the spectacle, began honking their horns in celebration.