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 ...

These defective purple-appearing street lights have made a fair amount of ... This process involves adding a phosphor layer to a blue LED, which, when powered on, appears to emit white light ...

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 ...