Andrew Gabriel wrote:

If you have neighbours, check that either the light doesn't
spill onto their property, or that they don't mind. If there's
a road nearby, check the light doesn't cause dazzle to road
users. Always adjust the light so the beam cutoff is below
horizontal to minimise light polution.


Yes! I do a bit of amateur astronomy and security lights are one of the
banes of my life. Most of them spill light upwards which is both a waste
for the owner and a nuisance to me.

Another Dave.