National Geographic, Feb. 1, 2014.
http://news.nationalgeographic.com/news/energy/2014/02/pictures/140201-super-bowl-xlviii-2014-green-stadiums/

"MetLife Stadium will light up in bright orange, blue, and green lights when the Denver Broncos play the Seattle Seahawks on Sunday.  The striking display that rings the top of the stadium is powered by LED light bulbs, which are already energy-efficient—but they are made even more so by the power source that runs along the same track. The 1,350 solar panels installed on the ring can generate enough electricity to power the colorful lights and other operations."