Streetlamp design light pollution comparison.
https://diqn32j8nouaz.cloudfront.net...s_fullsize.jpg
Previously:
https://www.homemadetools.net/forum/...251#post204025
https://www.homemadetools.net/forum/...045#post203094
https://www.homemadetools.net/forum/...775#post163628
https://www.homemadetools.net/forum/...732#post143773
https://www.homemadetools.net/forum/...571#post201216
