Spatial Daylight Autonomy - sDA(300/50%)
The Spatial Daylight Autonomy (sDA) should be 50% or greater, across at least 50% of the working plane, during occupied hours. The target illuminance (typ. 300lux) should be achieved for more than 50% of the time, throughout a typical year during occupied hours (8.30am to 4.00pm) across at least 50% of the working plane
Useful Daylight Illuminance - UDI-a (100~3000lux)
- The UDI-a (100-3000lux) should be >80% (ave) across the working plane during occupied hours. The level of illuminance provided below 100 Lux (UDI-s) and above 3000 Lux (UDI-e) should occur for no more than 20% of the time (ave).