US Streetlights Are Turning Purple
scientificamerican.com
US Streetlights Are Turning Purple
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Re: US Streetlights Are Turning Purple
#2Re: US Streetlights Are Turning Purple
#3Here's a video on the topic from 2 weeks ago: https://www.youtube.com/watch?v=Jfr8fmF8oJU
Pretty interesting.
Re: US Streetlights Are Turning Purple
#4A Trader Joe's in Phoenix has had these for so long (years?), the parking lot is bathed in almost completely blue light. They don't seem to care. It really throws off your vision and things look "fuzzy".
Re: US Streetlights Are Turning Purple
#5“ producing light that is comparable or better in quality.”
They don’t support this claim about led’s, and many groups are concerned about harsh cool light interrupting circadian rhythms. They’re also hideous.
Re: US Streetlights Are Turning Purple
#6A Trader Joe's in Phoenix has had these for so long (years?), the parking lot is bathed in almost completely blue light. They don't seem to care. It really throws off your vision and things look "fuzzy".
Maybe it's just me but the actual color of the light never bothered me. The first time I saw it I figured out it was a form of LED failure. It's so common here that I don't think about it anymore
Re: US Streetlights Are Turning Purple
#7TL;DR - coating is wearing off.
Re: US Streetlights Are Turning Purple
#8“ producing light that is comparable or better in quality.” They don’t support this claim about led’s, and many groups are concerned about harsh cool light interrupting circadian rhythms. They’re also hideous.
It depends strongly on implementation. LEDs can produce white light at any color temperature and CRIs ranging from terrible to great. Quality LEDs are quite nice indeed (when they're not turning purple).
Most LED streetlights replaced sodium vapor lights, though, which produce the sickliest, most horrible orange color known to humanity. Just about any LED is an improvement over those.
Re: US Streetlights Are Turning Purple
#9Better article with lots of pictures and diagrams, links to conference talks, etc:
https://inside.lighting/news/24-05/heres-why-led-streetlight...
Re: US Streetlights Are Turning Purple
#10TL;DR - coating is wearing off.
Sure, white LEDs are blue LEDs with a phosphorus layer. The Blue LED invention led to the 2014 Nobel Prize for Physics.