If you're smoking, then in reality your temp will be in a range. Plenty of people have smoked turkeys at 225 which is to say, the actual temp of the smoker would swing - generally 200-250, or maybe 210-240, depending on your smoker and how close you're monitoring it.
Are you stuffing it? A stuffed turkey will take extra time. I stuff mine with apples and onions and cook at 225, and it takes about 35 mins per pound.
An empty carcass would cook quicker.
I think you could cook it at 200 (175-225) but I'm not sure you'd want to do it that way deliberately. I would push it up to 225 at least. Also, it will take a looooong time to cook it that low.
But at 200 or 225, know that your skin won't be crispy, but your meat should be plenty juicy.
Good luck.