Iowa Department of Transportation explains why some street lights are blue

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Tampa Electric explains purple street lights in Tampa

Beneath a Purple Night - The Purple Streetlights Conspiracy

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Have you seen purple streetlights on the highway? The Department of Transportation explains why

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Why are streetlights in the Vegas Valley glowing purple?

Photoelectric light controls are weirder than they seem

RF test on purple street lights (black lights) with EMF meter.

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Defective street lights leave Florida drivers seeing purple

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Going Green