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

Market sizing
Recent activity on May 12, 2019
1.9 k Views

For the expert here,

do you hava any goos idea.

thank you

(edited)

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[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?

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.

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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