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I saw this in another answer and I would like to know how to do it:

"Making a light source invisible to everything except shadow rays will cause it to only block light from other light sources and not influence anything else."

Thank you!

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There are two ways to do this.

Materials nodes:

enter image description here

Ray visibility:

enter image description here

Using these ray visibility checkboxes instead of nodes will speed up render times a little, however you lose the flexibility of nodes.

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