This page gives some basic details about the Raw Total Lighting Color Channel and explains how it is used in compositing.
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||Node Editor|| > Add > Render Channels > Color Channel > Type > Raw Total Lighting
The Raw Total Lighting channel is useful for changing the appearance of the entire lighting of the scene after rendering, using a compositing or image editing application. Below are a couple of examples of possible uses. The first two images show the render element itself and the Beauty render put together. The Raw Total Lighting Render Channel was brightened and tinted differently to show the range of editing possible.
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Raw Total Light x Diffuse = Total Light
Raw Light + Raw GI = Raw Total Light