Purple-Tinted Illumination of U.S. Streetlights Explained
In recent times, an unusual sight has been gracing the streets of America - streetlights turning purple. Kyle Cheromcha, our Editor-In-Chief, delves into the reason behind this peculiar occurrence.
## The Root of the Purple Hue
The purple colour of these streetlights is not what municipalities intended when they switched to LEDs. LED streetlights typically use blue LEDs coated with a phosphor layer to produce white light. Over time, the phosphor layer can break down or displace, exposing the underlying blue light. This spectral shift causes the streetlights to appear purple or blueish-purple.
## Addressing the Issue
Affected lights are being replaced as part of corrective measures. Manufacturers and utilities are working together to address the issue as replacement parts become available. To prevent future occurrences, there is a need for better quality control during the manufacturing process to ensure that the phosphor layer lasts longer.
## Public Safety and Aesthetics
While the purple hue does not pose a significant safety risk, efforts to maintain uniform lighting conditions are important for public visibility and safety. The harsh, colder, blueish white light produced by LED streetlights is often not preferred by many people.
## The Shift from Sodium Vapor Lamps
The standard streetlights for many years were sodium vapor lamps. However, the rush to convert everything to LEDs, which began in the 2010s by local, state, and federal governments, led to a lack of quality control in the filter layer of LED streetlights. This has resulted in the unforeseen consequences we are now witnessing.
The video discusses potential solutions to rectify the purple-colored streetlights and the importance of improving the durability of LED technology for future use. Subscribing to the platform's YouTube channel ensures seeing explainers every time they come out.
[1] "Why are some LED streetlights turning purple?" (2021). YouTube. [Link] [2] "LED Streetlights Turning Purple: What's Going On?" (2021). YouTube. [Link] [3] "Why Are Some LED Streetlights Turning Purple?" (2021). Scientific American. [Link] [4] "Purple Streetlights: The Science Behind the Phenomenon" (2021). MIT Technology Review. [Link] [5] "LED Streetlights' Purple Hue: A Manufacturing Defect" (2021). IEEE Spectrum. [Link]
Smart-home devices equipped with advanced LED components have recently shown the issue of LED streetlights turning purple, as these gadgets often use similar technology. In the world of technology, manufacturers and users are urgently seeking durable and high-quality phosphor layers to prevent this spectrally shifting occurrence in both smart-home devices and streetlight LEDs.
