Why do street lights turn purple? When streets glow purple at night, people usually react in one of two ways.
Sci-fi fans may associate it with an alien invasion or the beginning of the end of the world. But others seek a more grounded explanation: our everyday street lights change colour. These lights, which usually go unnoticed, now stand out in cities.
This article will reveal the cause of this colour-changing phenomenon. Don't worry - the cause is not an alien invasion, just simple science.
Why are street lights fading to purple?
Residents across the United States have been noticing an anomaly in their neighbourhoods: street lights that used to emit bright white or warm yellow light are gradually turning purple.
Naturally, this has sparked confusion and curiosity. The main reason? The manufacturing process of some LED lights is defective.
LED street lights produce white light through two components: a blue diode and a yellow phosphor coating. When the two work in tandem, they produce bright, clear illumination. But when the phosphor layer fails or ages, the blue light from the diode leaks out. If left unchecked, the blue light will mix with the remaining yellow coating to form a purple or violet halo.
This change is not instantaneous. The coating wears off gradually, so the street light turns purple silently, without any maintenance work.
What causes the coating to wear off?
If you ask a professional, 'Why are street lights turning purple?' , they will point to a number of reasons.
Weather has a significant impact. High and low temperatures, sunlight, and rain all accelerate coating wear. When cities experience these weather extremes, street lights may fade to purple more quickly. This explains why certain cities are seeing more purple street lights, even if they are sourced from the same supplier.
Another reason is quality control issues during the manufacturing process. Street lights are so common that we tend to take them for granted.
When a street light breaks, cities need to replace it quickly, and the process is usually smooth and efficient.
The primary responsibility lies with the luminaire manufacturers. In order to meet the city's needs, they need to speed up the production process. When the production process is rushed, there can be oversights - such as skipping critical tests that result in luminaires failing weathering tests in real weather conditions.
In rare cases, improper installation or voltage fluctuations can accelerate phosphor deterioration. But these are not the main causes of lights turning purple; they simply exacerbate the original problem.
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Most purple street lights result from unstable phosphor coatings and inadequate quality control. Luxsky Lighting's new streetlights, with upgraded coating materials and enhanced production testing, eliminate purple discoloration at the source and provide cities with stable, long-lasting quality lighting.
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