BIM for Architecture, Engineering, and Construction Curriculum

Key Terms

The following key terms were used in this lesson:

Sky Illuminance

A measure of the sky\u2019s brightness. Illuminance is the total amount of light coming from the sky based on a project\u2019s location and sky conditions. The sky illuminance is not affected by project orientation.

Design Sky Illuminance

The sky illuminance level that is exceeded 85 percent of the time between the hours of 9 a.m. and 5 p.m. throughout the working year. This is a conservative design value for daylighting analysis.

Daylight Factor

The amount of daylight at a location measured as a percentage of the design sky illuminance.

Daylighting Level

The intensity of daylight at a location measured in footcandles. Appropriate levels are defined by the intended uses of each space.