This option performs climate based daylight modelling (CBDM) simulations to analyse UDI (Useful Daylight Illuminance). UDI is a set of up to four percentage bands for every point on the space working plane defined as follows:
The percentage of time where the points’ illuminance is:
- Below a minimum lux threshold where full electric lighting is needed.
- Between a range of lux values where supplementary electric lighting is required.
- Between a useful minimum and maximum value where no electric lighting is needed.
- Above a maximum value, which could result in glare.
For more information on how to run UDI simulations, please refer to Useful Daylight Illuminance.