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According to fastcompany.com: "Last year, U.S. consumers spent about $1 billion to buy about 2 billion lightbulbs--5.5 million every day."

According to wsj.com: "The U.S., which has four billion electric lights using [incandescent] bulbs, represents about a third of the world market."

So, about 12 billion bulbs, worldwide.

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โˆ™ 2009-03-22 17:23:49
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Q: How many light bulbs are there in the world?
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