Because there are a lots of lights in the stadium.
There are 720 stadium lights.
All MLB stadiums have lights, although the Cubs were the last to get lights at their stadium and the last to play a night game at home.
The Stadium of Light is a football stadium in England, home to Sunderland Football club.
The playing field measures 100 yards and each end zone is 10 yards deep. The total is 120 feet.
Flood lights are used as they are low glaring lights !
the cubs
light bulb
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in the mine, go to the door with the lights and you will see them
I think they were used as the LED lights for the opening ceremonies.
The lights on a covered stadium, do the same job but it is not solar energy