I am trying to do CBDM analysis for different types of rooms and I was wondering about the metrics of ASE and sDA.
What is generally asked it to have sDA of 300lux for more than 50% of the occupied time and
the ASE should be less than 10% of the room’s area receiving 1000 lux for 250 hours.
I was wondering how did these numbers came up? What is the backround research on these?
For hot climates would it be better to use ASE for 3000 lux if this the direct sunlight? And why they ask for 250 hours and not more?
Also, if I set the occupied hours from 4AM until 10PM I should have 6570. The analysis shows 4453 hours. The results are based only on daylight-sunlight hours and do not include night time even if you use a broader range?
Moreover, do these calculations of Useful Daylight Illuminance, Annual Sunlight Exposure and Spatial Daylight Autonomy use the three phase method? Or each one uses a different method?
Thank you for your time!