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The following description in Arnold manual is written. (
https://support.solidangle.com/display/A5AFMUG/Mix+Shader )
"The Add mode is used for adding two shaders that only emit light."
I don't know "shader that only emit light".
What shader is that shader?
Well if you don't know them .. you may not really need them
... btw aiblackbody and any flat color shader when not attached as texture to a material slot ... may be seen as an emitter.
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