"Edwin Spector" wrote in message
...
Good questions. Re light pollution avoidance, don't use up-lights on
trees and
stuff. Much of the light goes straight into the sky.
Lots of resources available at http://www.dark-skies.org/
Specifically, advice from the The Institution of Lighting Engineers,
available
at http://www.star.le.ac.uk/~dbl/cfds/ile-gd-e.htm
Regards
Edwin
Bath.
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Thanks, I'll have look at their recommendations.
Neil