The led's are actually BLUE and the phosphorus is yellow (blue passing through yellow results in white) the phosphorus is burning away...resulting in some phosphorus being left which emits a purple color light output and eventually will be blue light once the phos is all burned off.
Why only at intersections? In my closest city I drive through everyday the blue purple lights are in all the corners of major intersections. All other lights leading up the intersection are normal…weird
The led's are actually BLUE and the phosphorus is yellow (blue passing through yellow results in white) the phosphorus is burning away...resulting in some phosphorus being left which emits a purple color light output and eventually will be blue light once the phos is all burned off.
Why only at intersections? In my closest city I drive through everyday the blue purple lights are in all the corners of major intersections. All other lights leading up the intersection are normal…weird