Why streetlights on Milwaukee interstates, highways are purple

Glowing under Purple Street Lights

What's with the purple/UV lights we've got around the city 🤨 : r/phoenix

Here's Why You're Seeing Purple Street Lights In Some Metro Cities - CBS Minnesota

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Why some streetlights are purple in Green Bay, Oshkosh, Wausau

WisDOT: Manufacturer defect causes purple-blue lights on highway

Do you know why some Milwaukee highway and interstate lights are purple?

How are lightbulbs on US interstates changed? - Quora

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Why are the streetlights purple on I-96 near Lansing?

Why some streetlights are purple in Green Bay, Oshkosh, Wausau

Curved road night hi-res stock photography and images - Page 7 - Alamy

Do you know why some Milwaukee highway and interstate lights are purple?

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