In the lighting section of your favorite home improvement store, you might see boxes of Philips light bulbs with a rather odd equation printed on the label: "43w = 60w." No, it's not a secret code, nor is Philips promoting a weird sort of math that repeals the reflexive axiom of basic arithmetic. Instead, Philips is trying to help customers understand that new incandescent light bulbs using 43 watts of electricity produce the same amount of light as old incandescent light bulbs using 60 watts.
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