What is sustainable outdoor lighting?

sus·tain·a·ble
səˈstānəbəl
adjective
1. able to be upheld or defended.
“sustainable lighting reduces adverse impact to the environment”
2. Sustainable outdoor lighting uses the least amount of energy necessary to accomplish the task and is installed so as to minimize the adverse effects on the environment. 
Sustainability

            Stay tuned. Much more to come…

Reducing global lumens