[Daylighting control]Why my lighting power is almost same with different illuminance setpoints?
I am working on daylighting control in EnergyPlus and have a problem. I defined two different daylighting controllers, with different illuminance setpoints. 500 lux and 10 lux. I expect to see two different curves since the setpoints have huge differences, however, they almost overlap with each other.
1) The lighting power is zero during daytime, it makes sense because I checked "Daylighting Reference Point 1 Illuminance", which is always above the setpoint during daytime, so we don't need artificial lights to maintain the target illuminance.
2)The lighting power shows a slight difference at around 5:00 AM and 7:00 PM, which also makes sense to me. Because during this period, the illuminance level is lower than 500lux but higher than 10 lux, so the light is working in different powers.
3)However, during the night, both controllers work at full capacity, which confused me a lot. I know there is no natural light during the night so we rely on artificial lighting, but I have different setpoints!!! And I tested control mode "continues, continues-off and stepped", the light should work in different power right? But when I check "Daylighting Lighting Power Multiplier", they are always 1 during the night. Anyone can help me with this? Thank you!
More information:
1) I checked the sensor, it is in the middle of the zone
2) I tried different availability schedules for daylighting controllers. Include "always on", or the same schedule schedule as the lighting schedule.
3) The lighting schedule is default, (DOE prototype single family house), I also tried to change to "always on".
