Traditionally, paved roads and pedestrian walkways have been illuminated by streetlights emitting a bright white, orange, or yellow glow. The aim is visibility, not aesthetics, and rarely will ...

The purple lights are not for aesthetics. They're a manufacturing defect. The coating on the phosphor layer, which blocks blue wavelengths, is wearing out, throwing off the color of the light.

The aim is visibility, not aesthetics, and rarely will streetlamps ... “The referenced ‘purple light’ effect is due to a spectral shift caused by phosphor displacement seen years after ...