New LED streetlamps emit a bluer light (consequently whiter) than the yellow low pressure sodium streetlamps that used to dominate. This might cause sleep disorders.
However, reverting to a yellower light will likely run into resistance, as the whiter light is likely perceived as more classy than the ugly outdated technology of yellow sodium lamps.
Ironically, yellow LEDs existed long before the blue ones which power white LEDs, or mix red and green LEDs.
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