the following workflow only generate zero values for a facade illuminance level under cloudy sky simulation.
May I ask what I’m missing here?
Thank you!
daylight_sim_error.gh (553 KB)
another question is why the daylight simulation component doesn’t accept uniform sky for radiation analysis?
Yes. In your CIE sky type you connected for the hour input the slider with value 4. So at 4 am … no light 
-A.
oop sii…! so careless am I…
Radiation analysis is based on your weather conditions (epw) so you need the climate based sky.
-A.