OK, I tried briefly to answer your question.
I found this in a YouTube video comment about the bridge,
but then I lost the link while looking for other sources.
Quote:
Uploaded on Sep 22, 2009
Cree, Inc. LEDs are used in the LED streetlights.
Maybe in the blue "wash" lighting as well.
LED streetlights are more energy efficient than other forms of lighting,
and last longer. Saving MnDot money every year.
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Here's they are testing the LED's
Here's another view of the bridge that I like...