An affected streetlight's bluish-purple glow makes for an oddly fascinating scene at night, but the darker glow also makes seeing the roadway more challenging at night because the human eye can't pick ...

A street lamp on 40th St at Keswick Road. A street lamp that once burned a daylight glow now casts a purple light, mimicking the glow of ultraviolet light onto Falls Road near Meadowood Regional Park.

Purple streetlights still glowing in Las Vegas, the concern: a lower level of light makes the roads less safe. It is not intentional. The purple hue is due to a manufacturers defect.

Cone-shaped photoreceptors in the human retina become active when exposed to daylight, enabling people to discern color. But in low-light conditions, rod-shaped ones become responsible for vision.

STEVE appears as a streak of purple, sometimes bordered by a green glow, in the night sky alongside an aurora. ZUMAPRESS.com STEVE in the sky earlier this year.

LAS VEGAS, Nev. (FOX5) - Bluish purple streetlights are now something you can find all over the Las Vegas Valley from Henderson to North Las Vegas. Why are streetlights glowing this unusual color?