The article involves a remote device watching the light bulb but it would also make sense to think about devices in the room as well. Your device might have it

The article involves a remote device watching the light bulb but it would also make sense to think about devices in the room as well. Your device might have its microphone disabled, in hardware even, but I wonder if the ambient light sensor has enough gain to see audio frequency variations in room lighting. We already know hard drives and speakers and whatever else can act like mics for exfiltration...