在新选项卡中打开链接
  1. Scientific American
    https://www.scientificamerican.com/article/streetlights-are-mysteriously-turning...

    Streetlights Are Mysteriously Turning Purple. Here’s Why

    • Updating streetlights to use light-emitting diodes makes sense. LEDs are one of the most energy-efficient lighting technologies that currently exist, according to the U.S. Department of Energy. They also tend to be … 展开

    But Why Are Some Streetlights Suddenly Turning Purple?

    The phosphor technique is sound, says Ram Seshadri, a materials science professor at the … 展开

    Scientific American
    How Does The Purple Light Affect Vision?

    Suddenly finding yourself in a street bathed in garish purple light can be unsettling. But a bigger concern is that this light can change how drivers and pedestrians perceive their su… 展开

    Scientific American
    Why Street Lights Across America Are Turning Purple
    Streetlights tend to serve two main purposes. They exist to illuminate the streets for drivers to see better, and to make public spaces more welcoming and less scary for pedestrians at nig…
    The Autopian · https://www.theautopian.com/w…
    反馈
    目录
    But Why Are Some Streetlights Suddenly Turning Purple?
    How Does The Purple Light Affect Vision?
     
  1. Phosphor coating
    When the phosphor coating on a street light degrades over time, the light can appear purple or blue. This degradation can lead to cracks, adhesion issues between the LED chip and the silicone-phosphor layer, or even complete delamination. Without the phosphor coating, the LEDs emit blue or purple light instead of white light.

    Why Are Street Lights Turning Purple? Causes and Solutions

    www.agcled.com/blog/street-lights-turning-purple-causes-solutions.html
    www.agcled.com/blog/street-lights-turning-purple-causes-solutions.html
    这是否有帮助?
  2. 其他用户还问了以下问题
    Are purple streetlights safe?
    Bullough says he believes purple streetlights aren’t good for driver or pedestrian safety. First, it’s possible that losing the phosphor layer dims the lamps’ brightness—and streetlights are supposed to emit a certain level of light depending on the type of the road that they’re used on.

    Streetlights Are Mysteriously Turning Purple. Here’s Why

    scientificamerican.com
    Why are my street lights turning purple?
    And yet some streetlights have suddenly turned a jarring shade of purple. It is hard to determine the exact cause without dissecting one of the defective lights, but scientists have a hypothesis: bright purple light suggests the phosphor layer around the lights has been “delaminated”—peeled off—exposing the blue LED light underneath, Brgoch says.

    Streetlights Are Mysteriously Turning Purple. Here’s Why

    scientificamerican.com
    Do streetlights emit purple light?
    May 20, 2024 In recent years, from Boston to Billings and from Winnipeg to Winston-Salem, communities across the United States and parts of Canada have reported a peculiar phenomenon: streetlights emitting purple light.

    Investigating the Purple Light Phenomenon in LED Streetlights

    inside.lighting
    What's behind purple streetlights?
    The LSRC's investigation highlighted the technical specifics behind the purple streetlights, focusing on a particular type of LED used in the affected streetlights: the chip-scale package (CSP) LED chip. These LEDs are designed with a chip-sized silicone phosphor layer adhered to the top surface of the LED chip.

    Investigating the Purple Light Phenomenon in LED Streetlights

    inside.lighting
    Are purple streetlights affecting drivers?
    Anecdotal reports of purple-looking streetlights have been popping up since early 2021 in states including Florida, Utah, Texas and Massachusetts, as well as in Canada and Ireland. This phenomenon might seem weird but innocuous. After all, what But it turns out that the hue of the light illuminating a roadway could affect how drivers and

    Streetlights Are Mysteriously Turning Purple. Here’s Why

    scientificamerican.com
    Why are there purple streetlights in Vancouver?
    In other words, some kind of trouble in the fancy package surrounding the LED. 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.

    Why Faulty Streetlights Are Turning Cities Purple — and Why It's

    businessinsider.com
    反馈
  3. CBC
    https://www.cbc.ca/news/canada/british-columbia/...

    Why thousands of city street lights are turning purple

  4. Inside Lighting
    https://inside.lighting/news/24-05/heres …

    Investigating the Purple Light Phenomenon in LED …

    2024年5月20日 · This unusual color shift has garnered widespread attention, with numerous local news stations and newspapers reporting the events including a brief explanation of the cause.

  5. Business Insider Nederland
    https://www.businessinsider.nl/the-weir…

    The weird, worrisome mystery behind America’s plague …

    2022年11月29日 · The mystery of the purple lights appears to be both more mundane and more worrisome than anyone has realized — a mood-indigo check-engine light on the entire infrastructure of modernity. When LED streetlights …

  6. AGC Lighting
    https://www.agcled.com/blog/street-lights-turning...

    Why Are Street Lights Turning Purple? Causes and Solutions

  7. Business Insider
    https://www.businessinsider.com/led-c…

    Why Faulty Streetlights Are Turning Cities Purple — …

    2022年11月29日 · The mystery of the purple lights appears to be both more mundane and more worrisome than anyone has realized — a mood-indigo check-engine light on the entire infrastructure of modernity. When LED streetlights …

  8. The Autopian
    https://www.theautopian.com/why-stree…

    Why Street Lights Across America Are Turning Purple

    2024年2月27日 · Streetlights tend to serve two main purposes. They exist to illuminate the streets for drivers to see better, and to make public spaces more welcoming and less scary for pedestrians at night. Traditionally, …

  9. MotorBiscuit.com
    https://www.motorbiscuit.com/why-stree…

    Why Are Street Lights Mysteriously Turning Purple in …

    2022年12月7日 · The reason why street lights are turning purple in cities is because of defective LED lights. For Duke Power, the defective LED lights affect only 1% of the total street lights. However, that percentage amounts to …

  10. OhmConnect
    https://www.ohmconnect.com/blog/smar…

    Some Streetlights Are Turning Purple — Here's What …

    So, Why Are The Streetlights Turning Purple? According to Neil Egan, a representative from Acuity, the root cause behind the mystery of the purple streetlights is "phosphor displacement seen years after initial installation." In …

  11. Boston.com
    https://www.boston.com/.../02/why-str…

    Why some street lights on I-93 — and around Boston …

    2023年6月2日 · Drivers in the Boston area — and across the US — have encountered streetscapes bathed in purple in recent years. The phenomenon, which some have dubbed “ The Great Purpling,” is caused by defective …