Don't know about losing lighting but I do know that with Hue if you get a power blip in the middle of the night all the bastard bedroom lights come on full strength.
edit - "Sorry, this product does not support 'power-on behaviour' " :( Must be third party smart bulbs. But I can swap them for Hue bulbs from another room, it's only the bedroom where the power-on matters.
Don't know about losing lighting but I do know that with Hue if you get a power blip in the middle of the night all the bastard bedroom lights come on full strength.