IES LP-3-20:2020 Edition

Daylighting refers to the art and practice of admitting beam sunlight, diffuse sky light, and reflected light from exterior surfaces into a building to provide ambient and/or task lighting to meet the visual and biological needs of the occupants. The design of a daylit building is a challenging task demanding an integrated design approach to simultaneously address occupant comfort, lighting quality, and energy efficiency across a wide range of daylight and weather conditions. Properly daylit buildings offer additional benefits that include occupant health and satisfaction, connection to the outdoor environment, and reductions in maintenance costs and greenhouse gas emissions. This document provides detailed discussions and guidelines on the design and performance of these systems. The contents of this document are of value to architects, electrical and mechanical engineers, interior designers, landscape architects, contractors, equipment and material manufacturers, as well as end users such as developers, building owners, and facility managers.