Light fixtures that illuminate sideways and upwards are lighting the skies. That's both a waste of energy and just plain rude. And the skies are ever so much brighter because of it. For all my griping about the light pollution ruining my star parties, I've done precious little to remedy the situation. But we can all do some simple things to start making the skies darker around here again and at the same time lower our outrageous energy bills.
Light going up or horizontally is wasted.
Use lights that illumine only what you need lit. Unnecessarily bright lights are wasteful, and rude. Hook up outdoor lights to a timer or motion detector. Those of us who are more socially conscious can do even more. Use this to help de-pollute your house, and then give it to your neighbors or city council members.