The purple hue is the result of the delamination of the phosphor-silicon layer in the streetlights' LED chips. In this case, tens of thousands of LED bulbs installed along streets and parking lots ...

Phosphors can deposited onto an LED die surface (‘local phosphor’), or made into a free-standing structure – like a dome – and positioned over a blue LED (‘remote phosphor’). “Remote is our main ...

or use a blue LED and cover it with yellow phosphor that filters blue wavelengths and ultimately produces a bright white light. The thickness of that layer determines the warmth of the light ...

A purple wave of faulty streetlights has swept across the USA, generating incorrect theories, bad lighting and fans of an accidental aesthetic.