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Just some thoughts:

-The BCL places the Daylight Sensor at the center of the room (as its name implies). Maybe your room is too deep and the window size is small. Therefore a daylight control in the middle of the room might work to your disadvantage. The daylight sensor keeps trying to meet the 45 fc target and as a result, it overworks the electric lights.

-The OS daylight sensor has a horizontal arrow which should be pointing to the window and a vertical arrow that should be pointing up.

-Action items: Change the location of the daylight control to a one closer to the window. Also try: 1, ! Lighting Control type.

Hope that helps.