Light-Dark Cycle in the Built Environment

This study examines how the quantity of light within an interior built space varies due to architectural conditions such as size of floor plate(s), number and configuration of exterior wall penetrations, solar orientation, type of electrical light fixtures, and reflectivity of vertical & horizontal surfaces. There is a growing body of evidence that insufficient light levels during the day and excessive light levels at night can adversely affect human health and well-being. Two historic landmark residences in southern California were selected as subjects for recording light levels using sensor watches.