Photography, flashlight and the Inverse Square Law theory

For all the enthusiast photographers out there, I’d like you to have a look at probably the best lighting tutorial I’ve ever seen by the excellent photographer Mark Wallace.

This will really help you understanding the Inverse Square Law theory, and will give you powerful tools to do the level up in your flashlight photography.

TL;DR:

Basically what is theĀ Inverse Square Law theory all about?

If the subject is twice the distance from the souce of light, it will receive a quarter of the illumination.
The math is easily shown in this picture :

Inverse_square_law_photography_cheat_sheet
Image taken from www.digitalcameraworld.com

This will help you with your low key portraits!