The metrics described in this document are intended
to be applicable to common workplace environments.
They are based on an analysis of open offices, classrooms,
meeting rooms, multi-purpose rooms, and
service areas in libraries and lobbies, and so are
most applicable to areas with similar visual tasks.
These metrics are neither counter to, nor do they
supersede, IES task lighting criteria for these space
types. These metrics do not directly address energy
consumption, as electric lighting management is
The area of analysis for these metrics is ideally
a coherent “space”, defined by opaque walls and
access to daylight through at least one wall or ceiling
surface. It is also possible to apply these metrics to
the “regularly occupied” floor area of a building, or
some part of a building, such as one floor plate. It is
important to specify the “area of analysis” to which
the percentages apply.
These metrics were derived from a study of daylit
spaces in the continental United States, and thus
are most applicable to similar latitudes and cultures.
Spatial Daylight Autonomy
sDA – Introduction
sDA – Climatic Modeling Methodology
sDA – Simulation Output Formats
Annual Sunlight Exposure (ASE)
ASE – Introduction
ASE – Building 3D Modeling Details
ASE – Climatic Modeling Methodology
ASE – Simulation Output Formats