analysis_monthnumberdefault: 31–12 (step 1)Month for the representative design day (1 = January, 12 = December).
December represents the worst-case low-sun daylighting condition in northern latitudes. June gives the best-case. March/September are equinox reference conditions.
analysis_hournumberdefault: 106–18 (step 1)Hour of day for the daylighting snapshot (6–18).
10:00 and 14:00 are standard assessment hours. 10:00 captures morning working conditions; midday gives peak illuminance for top-lit spaces.
target_illuminance_luxnumberdefault: 300100–1000 (step 50)Minimum useful daylight illuminance threshold. EN 17037 recommends 300 lux for offices, 100 lux for residential.
Raising the threshold from 100 to 500 lux identifies more buildings as underlit, highlighting denser intervention areas.
sky_conditionselectdefault: clearclear | overcast | intermediateSky luminance distribution model. Clear sky gives high directional illuminance; overcast gives diffuse uniform illuminance.
Overcast sky is the standard worst-case for daylighting assessments (BREEAM, LEED). Clear sky identifies glare risk and high-illuminance zones.
Run with default settings (March equinox, 10:00, clear sky) for a standard daylighting assessment. Then: - Switch sky_condition to 'overcast' for worst-case BREEAM-style assessment - Reduce analysis_month to 12 to simulate winter conditions - Lower target_illuminance_lux to 100 for residential compliance check Buildings shown in red fail the target threshold and may require larger windows, light wells or reflective internal surfaces.