The weird, worrisome mystery behind America's plague of purple streetlights
. That was the big breakthrough — just wrap the blue LED chips in a complicated package of glass, sealant, solder, wires, and so on. Do it cheaply and reliably enough, and you've got yourself a global business.Ezra Bailey/Getty; Anna Kim/Insider
Representatives of the affected cities offer a little more detail."The purple streetlights are a result of the phosphor coating delaminating from the LEDs," says Fiona Hughes, a representative for the city of Vancouver. Brooks, of Duke Power, points to the same cause."There's a laminate on the fixture that gives it its white color," he says."As that laminate began to degrade, it caused the color tint to change toward purple.
Acuity's LEDs aren't the priciest ones out there. But that doesn't mean the company itself caused the problem. According to Acuity's 10-K filing, the company's 19 factories in North America make a few precision components and do assembly. But Acuity outsources the actual LEDs from"third-party vendors" in Asia.
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