Hi there.
This might be asking too much, but I thought it was worth asking.
Having optimised a window design in order to achieve a desired DF, is there a way to then calculate how many hours will then require artificial illumination, and to eventually arrive at a figure for lighting loads throughout the year? Presumably this would also need some class of occupancy schedule to say when lights would and would not be on.
Like I said – it’s a lot to ask – but if anyone has an idea – I would appreciate your guidance.
Giles.

Daylight Autonomy
Hi Giles,
No, not too much to ask...
Check out the Daylight Autonomy feature.
You may also want to have a look at the Photoelectric Sensing feature under the Calculate > Advanced Daylighting.
Both features are discussed in the help file.
I hope it helps you achieve what you are after.
Best,
Olivier
Artificial Lighting Loads
Giles,
Did you manage to calculate the artificial lighting loads throughout the year? I am interested in calculating the same thing but I cannot arrive to an answer with the comments here. Does anyone else can help us?
Thanks in advance,
Maria
HiSince ecotect using CIE
Hi
Since ecotect using CIE overcast sky model for daylight factor calculation, so you can not get an actual annual loads just by ecotect itself. I think exporting DAYSIM is suit for your need.