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How do I create emission material and then hide the plane that emits the light in Blender 2.81?

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    $\begingroup$ Are you trying to get the same effect as an Area Light? You can press Shift+A, Light > Area to add one of those. $\endgroup$
    – stphnl329
    Jan 4, 2020 at 23:41

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Use the Light Path node to make the material appearance different from its influence.

From Add > Input > Light Path use the Is Camera socket to mix between your Emission Shader and a Transparent Shader.

enter image description here

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