The Inverse Square Law of Light Explained in Simple Terms for Photographers, Part II

A few weeks ago we shared with you the first part of a series Karl Taylor created, explaining the inverse square law of light. That is, the intensity of light given off from a source is inversely proportional to the square distance from the source. In the video he shares a number of examples, using a model and his own setup as a demonstration. Now, he’s back with part two.

In this follow-up video, Taylor briefly touches on his previous coverage of the inverse square law of light. From there, he dives right into the examples, wasting no time showing off a number of situations that weren’t covered in the first video.


Even if you understand what the inverse square law of light is, Taylor’s demonstrations do a great job of showing off how dramatically it will affect your work and how best to make use of it.

Part two comes in at four-and-a-half minutes. To catch up on the first part in the series, check out our previous coverage.

(via Photography Bay)

  • Leo

    A great video and clear explanation of the law itself as well as the fastest demonstration I’ve ever seen LoL. Love a lot of your videos Karl, thanks for a part 2 to your last video.

  • Mark

    As every child who has ever done physics at school will tell you, the inverse square law only applies to point sources, not to softboxes.

  • p mow

    This seems like a terrible example. Two flashes (in addition to the softbox), two f-stops…really?