Indoor Daylight
Robust DF for uneven spaces
The Median Daylight Factor is the median DF value across a room, rather than the mean. In rooms where a few very bright areas (near windows, rooflights) would inflate the average, the median provides a more representative picture of typical conditions.
Median DF is particularly used in Australian planning assessments and in contexts where regulatory thresholds are based on the distribution of DF rather than the average.
- Median rather than mean — more robust in uneven spaces
- Used in Australian planning assessments (SEPP65)
- Useful for atria, deep floor plans, and top-lit spaces
- Reduces bias from very bright perimeter zones
- Part of the core DF module