I have no idea, just thought was interesting. They say defect in bulbs but??? https://halturnerradioshow.com/index.php/en/news-page/world/streetlights-are-now-identifying-the-jabbed-they-glow-when-they-walk-by-them-for-real
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The idea that defective LEDs turn blue/purple is at least feasible: white LEDs are actually blue LEDs covered with a phosphor that downconverts some of the blue light to the rest of the visible spectrum. Defective LEDs might have a bad phosphor layer that peels off or decays from the heat.
The fluorescent veins though... shudder.