Inverse Square Law of Light

How important is it to meter the studio light after I move it? To answer that question first answer this question.

I have a studio light and a model standing about one foot from the light. I move move my model two feet from the light. She is being illuminated by half as much light… right? Wrong, moving the light twice the distance from the subject means the model is now only receiving 1/4 as much light! The answer lies in the Inverse Square Law of Light. You might not need to memorize this rule, understanding what it means will help you better understand studio lighting and lighting adjustments.

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