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> If it's a color change bulb it restarts as a white light.

That's actually configurable, since a 100% bright white light isn't always what you want.

Is it? I've never seen that option. Is it part of a newer bridge/firmware?

Go to the bulb settings itself, "power on behavior".

It might require 3rd party apps like iconnecthue to configure, but it's been supported for many years on the bulbs.