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

White lighting LEDs are almost universally a combination of a blue light-emitting InGaN die and a phosphor that steals some of the blue light and converts it into a broad spectrum peaking at yellow or ...

In this method, the blue LED is used in conjunction with a yellow phosphor coating. The idea is to have part of the blue light converted into yellow light and leave a part of it in its original ...

The advantage to using a blue LED and a yellow phosphor is its high theoretical efficacy, which is attractive for the creation of a cheap, bright white-light source. However, this benefit comes at ...

"Warm" (amber-shifted) white phosphor-coated LEDs. "Cool" RGB (Red-Green-Blue) LEDs—light from three LEDs of ... to warmer-colored LEDs or different LED technology, we can dramatically reduce ...

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 ...

eventually falling off and allowing the blue light underneath the shine through. "It's not the phosphor itself that's failing but the binder that's attaching it to the LED, probably the silicon ...