I'll keep this updated throughout the day.
Yokohama Bay Stars
14,610 were in attendance for the Bay Stars first night game at Yokohama Stadium this year. At the start of the game, 55% of their lights were turned; that was bumped up to 75% from the 3rd inning; and in the bottom of the 5th, the umps requested all lighting to be turned on because it was getting increasingly difficult to see the ball. UPDATE 5/7 @ 1:26pm - The Bay Stars used about 8,000 kWh for their game yesterday, down from their May 2010 average of about 12,000 kWh.
15,704 fans attended the Eagles' first night game at Kleenex Stadium this year. Rakuten managed about a 15% reduction in energy usage.