I'm not sure if it's helpful when discussing Tolkien to think of "power" as something quantifiable, a number on a dice-roll table. Power is a very broad word which applies to all sorts of things, including natural phenomena and intangible ideas. A bear is powerful; so is a bulldozer, a Browning M2 , and Bach's B-minor Mass.
Of course here we're talking about what Hobbits clumsily mis-call "magic"; but even there Galadriel's Mirror and Thranduil's automatic gates aren't really the same sort of "magic" power. It's not like saying, "See! Eonwe has a Level 30 Magic Blast, but Galadriel with a +12 Nenya Bonus has the equivalent of a Level 32!"
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The entire plot of The Lord of the Rings could be said to turn on what Sauron didn’t know, and when he didn’t know it.
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