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Want to shoot a video in your living room but don't have any fancy lights? Depending on the space, there are often four sources of light in a living room: a ceiling light, a floor lamp, a table lamp and a window. In order to best utilize these common light sources, first determine the source of the primary light in your scene. Let's assume we'll light the room as if the main light is coming from a table lamp that is seen in the shot and a secondary light is coming from a floor lamp that is not seen in the shot.

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This can be used for still photography too.