You know and only you know, because it will be in the exact same mode it was in when you last turned it off. If that’s troublesome to remember then just get in the habit of putting it on moon or low before you turn it off. Or get one with his other 12 mode biscotti-esque driver instead where you can choose what you want. Some of his drivers do now have memory on/off options…if there’s one in the same size and he doesn’t offer the light you want with it, ask him and he’ll probably install it for you if you want.