how many light bulb are on at any given time in the USA

Market sizing
Recent activity on May 12, 2019
3 Answers
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dan asked on May 11, 2019

For the expert here,

do you hava any goos idea.

thank you

(edited)

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Anonymous A replied on May 11, 2019

I am not 100% about this, curious to hear feedback:

[Pop US] * [1/people per household ] * [# rooms per household] * [light bulbs per household] = # light bulbs in the US. Let's assume another 25-50% for businesses.

Once we have the # of light bulbs, we need to give out how many are on in any given time. Let's assume a standard distribution across the day and say that 6 hours out of 24 hours the bulbs are on.

We have [# of lightbulbs US] * [6/24] = # lightbulbs that are on per hour.

@ Others: would this work?

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Daniel replied on May 11, 2019

I agree with the previous answer. We might take additionally into account that not all bulbs are switched on at the same time - by a factor or so.

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Vlad
Expert
replied on May 12, 2019
McKinsey / Accenture Alum / Got all BIG3 offers / Harvard Business School

Hi,

That's one of the most common market sizing questions and I've seen the solution in multiple casebooks. You can find it easily if you google.

Best!

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