Here's my spin on motion lighting with dim level adjust. Notice the unconnected (lower left) node. I tried to use actual hall illuminance but the 
device I was using is so crappy with it's light range and very slow to update so I went back to my previous idea of using the outside light level and assume it means something about the hall light level. When I get a better device installed (like Hubitat with Homemade Temperature, Humidity, Pressure and Light sensor which are excellent BTW) I'll go back to using hall light level.
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