What Are Lighting Ratios and Why Are Important in the Studio? Lighting ratios are basically the mathematical ratio relation of light that falls onto a subject between two light sources, typically a key light on the highlight side and fill light on the shadow side. Say, for instance, you are creating a portrait and you set your key light to a certain power and you set your fill light to the same power. In this instance, because your fill light now has the same strength as your key light when it it is filling in shadows, it creates a 1:1 ratio and would actually eliminate all shadows producing flat lighting.

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