Re:Nobody Cares
by matthewdgreen on Thursday January 16, 2025 @01:16AM
(#42721949)
Here in Baltimore the city seems to have purchased a huge batch of defective LEDs that are actually purple. It’s disturbing when you encounter one.
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Re:Nobody Cares
by 1659447091 on Thursday January 16, 2025 @03:16AM
(#42722745)
The city employee who bought them is probably a massive Ravens fan...
i mean who wouldn't be the way they're playing
Re:Nobody Cares
by josephcsible on Thursday January 16, 2025 @01:50AM
(#42722153)
Nitpick: "are actually purple" makes it sound like they came out of the factory purple, but they're actually changing from white to purple over time as the phosphor coating fails.
They'll be near-UV LEDs with a phosphor to produce white, high efficiency, low cost, but garbage long term.
Re:Nobody Cares
by matthewdgreen on Thursday January 16, 2025 @09:32AM
(#42725645)
Just to be clear, these are about 1-3 years old. So yes they probably weren't purple on the day they were installed, but this is a defect and not normal aging. https://www.reddit.com/r/todayilearned/comments/136nz3b/til_...
Might be so that they don't interfere with a certain species of wildlife. We have deep blue ones near me that aren't visible by a protected bat species.
Re:Nobody Cares
by i_am_proteus on Thursday January 16, 2025 @05:31AM
(#42723641)
It happened in NC, too: https://www.dukechronicle.com/article/2024/10/duke-universit...
They’re purple (blue is the other option) because veins are harder to see under purple light. They’re used to deter drug use, from my understanding.
Edit: final clause
Re:Nobody Cares
by headsupernova on Thursday January 16, 2025 @10:05AM
(#42726223)
Not true, they're just defective and degraded quickly, resulting in the odd color.