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UE4 Interior Lighting, Lumen overall power of a light source, candela is…
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Lumens, candela and lux are all defined in terms of each other. A light source with a power of one lumen, which emits light uniformly an area of one square meter at a distance of one square meter, has an intensity of one candela. The illumination of a surface at a distance of one meter from this light source is exactly one lux.
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