Use dimmers, timers, or motion sensors to reduce output when the space is unoccupied.
Upward-directed light reflecting off atmospheric particles, obscuring the stars. Outdoor Lighting: Physics, Vision and Perception
Most outdoor lighting operates in this transition zone. Both rods and cones are active. Because rods are more sensitive to blue-green light, "cooler" lights can sometimes appear brighter at low levels, though they are harsher on the eyes. Use dimmers, timers, or motion sensors to reduce
Understanding how light behaves in an open environment is the foundation of effective design. Luminous Flux (Lumens): The total light output of a source. Outdoor Lighting: Physics, Vision and Perception