Average Daylight Factor

The average daylight formula is an empirically based rule for determining the average daylight factor at table height in a room.

Where

is the

T

Glazing Transmission

Daylight Factor (%)

W

Window Area (m²)

=

Ø

Angle of Visible Sky (degrees)

TWØ

A

Total Area of Surfaces (m²)

A(1-R²)