A couple of things: A)It reduces the overall airglow that ruins stargazing conditions, B) It reduces the confusion animals have when they attempt to navigate, C) Any light going up is not illuminating anything—reflecting that light downward where it does some good saves energy and reduces cost.
[[A)It reduces the overall airglow that ruins stargazing conditions,]]
Stargazin should be outlawed- it causes too many neck cramps- not one more next cramp is my motto
[[B) It reduces the confusion animals have when they attempt to navigate,]]
I thought they did a study awhile back that showed it was integral to navigation?
[[ C) Any light going up is not illuminating anything—reflecting that light downward where it does some good saves energy and reduces cost]]
I say too much light is bad- blinds a person- Causes cataracts- and makes ants angry-