It's not the only color for a cause Purple probably won't be the only porch light color you'll see. People use red porch ...

Yet there’s been a rise in recent years of reports that some streetlights are giving off a purple ... that filters blue wavelengths and ultimately produces a bright white light.

Question: I’m wondering about a light that seems to only be on at night on the traffic lights. It’s a small purple or blueish ... What you are talking about is a blue light and they are ...