- 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.www.agcled.com/blog/street-lights-turning-purple-causes-solutions.html
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Why thousands of city street lights are turning purple
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