Causes global pollution. Obliterates beauty of the night sky. Current lighting fixtures create widespread problems. This picture shows a typical widely used light. Unshielded lights create glare.
Glare decreases visibility.
Unshielded lights pre expensive. 35-70916 is wasted by going up in space. Wasted energy contributes to unnecessary global pollution. Unshielded lights cause light trespass into one's own home and violate privacy in others'. Uplight causes sky glow and obliterates stars, meteors, and the northern lights.