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I remember reading two scientific papers about this, one was about significantly increasing visibility around dusk and dawn, when the sodium lights are not very efficient (illumination-wise, not energy-wise) It could, for instance, help reduces accidents at pedestrian street-crossing. The other sounded less scientific and tried to show a decrease in crimes when using whiter lamps.

And I've heard so many times the argument "LED consume less energy" touted that I actually believed LED were much more efficient than sodium lights already. Could it be possible that the people ordering all new lights to be LEDs incorrectly assume the same?