What does the number in a standard light bulb base designation like 'E26' represent?
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The E stands for Edison, who designed the screw base, while the number 26 indicates that the base is exactly 26 millimeters in diameter. This standard size is used across North America, while Europe commonly uses the slightly larger E27 base. Photo: KMJ, Wikimedia Commons, CC BY-SA 3.0.
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Source: Wikipedia (CC BY-SA)
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