Astronomers already use a variety of optical filters, and LEDs tend to be “spectrally peaky”. If we standardized the spectrum used in street light fixtures, it

Astronomers already use a variety of optical filters, and LEDs tend to be “spectrally peaky”. If we standardized the spectrum used in street light fixtures, it could very easily be filtered out. I believe this has already been done when most street lighting was sodium lamps, which is also a very narrow spectra.