This guide explores how the physics of light interacts with human biology and psychology to shape our experience of the night. 1. The Physics of Outdoor Light

Crucial for outdoor safety. While we focus on a path, our peripheral vision (dominated by rods) detects movement in the shadows. 3. Perception and Psychology

The light reflecting off a surface toward the eye. This is what we actually "see."

Light intensity decreases exponentially with distance. In wide outdoor spaces, this necessitates strategic spacing of fixtures to avoid "black holes" between poles.

Exposure to high-CCT (blue) light at night suppresses melatonin in humans and disrupts the migratory and mating patterns of wildlife. Design Principles for Success

The human eye adapts differently depending on the available light level.

Use shields to direct light downward.