Hi Community,
since a few weeks I have a strange behavior of one and only one lightbulb within my smart home. It is a hue bulb that is part of a bigger lamp consisting of 6 bulbs.
All the lights are integrated to my system via the hue integration so that I can still use the hue app.
At some random time (mostly during the night) but also during the day, this one light just turns on. I can't identify any other activity that is happening at the time when the light turns on so I have no idea what causes this.
Also, this light is not part of any automation, script, etc.
Does anyone have an idea, why this happens and what I can do about it?
My idea for now, is creating an automation that is turning the light of, right after it turned on in case not all the bulbs of the lamp are on. But this is just a dirty workaround...
Have you reviewed the Activity logs for that specific device?
My guess is that you have something external to HA doing this. Routines in an app, Alexa routine or something like that. If the device logs says just "turned on" that is a good indicator.
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I have. It only says " turned on" - no automation, no trigger visible
As @fleskefjes mentioned, check the Hue App's native automations.
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I only ever used Hue and Alexa as potential other automations - non of them have a routine or automation with this light 
Hue only has 2 inactive automation; Alexa just a few voice commands that haven't been used in a while.
Temporarily disconnect the light and look for log errors
Alexa is where I'd start...
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If you don't use it just disconnect Alexa from Hue. The device log indicates that it's coming from outside HA. I don't use Alexa myself, but doesn't it have something a "learning mode" where it initiates lights on / off based on previous behaviour?
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Yep, they're called hunches
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