Another reason for sodium lights is that Sodium lights cut out the amount of ambient light that enters the night time sky ( light pollution) which can make stars harder to see at night. Where I live, San Jose, Ca, it is essential to have sodium lamps because on our highest peak there is a Observatory so there needed to be a check on light pollution otherwise that excess lighting would light up the cloud cover, fog, and all the stuff in the sky making it hard to see any stars. Just my two cents.
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Another reason for sodium lights is that Sodium lights cut out the amount of ambient light that enters the night time sky ( light pollution) which can make stars harder to see at night. Where I live, San Jose, Ca, it is essential to have sodium lamps because on our highest peak there is a Observatory so there needed to be a check on light pollution otherwise that excess lighting would light up the cloud cover, fog, and all the stuff in the sky making it hard to see any stars. Just my two cents.