Android Battery Device is unplugged. Philips Hue Set a scene in a room.

If phone unplugged between 10pm and 8am, set lights to dimmed

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If your phone is taken off charge between 10pm and 8am, Philips Hue lights in the set room will switch to dimmed. Good combined with turning off the lights in those hours (Charge phone to turn out lights, but if you pick it up they won't suddenly come on bright)