It's weird as I figured the same thing, but then noticed the one I do have setup is in the living room and periodically reports lux levels-- even when no one is home. I haven't figured out the frequency yet, but in turning lights on and off to test it appears to be every 5 minutes or so. I have it set up in HomeKit with an automation to turn on my lights if the lux is below 250 between 10am and 10pm.m. Has worked the past couple days without issue. I do have dogs, so thought maybe they trigger it, but the sensor is placed behind something so the motion isn't triggered.
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