Valuable oil is consumed. Precious natural gas is burned up. Coal is wasted. Hydorelectric energy is lost. Glare confuses and blinds our eyes.
Light trespass offends neighbors.
Safety hazards are created by glare and bad contrast levels. The beautiful night sky disappears. Full cutoff fixtures put light where it belongs, on the ground. Shielded flood lights reduce glare and save money. Timers and motion sensors conserve energy.