Specular only lights with Cycles

Hi,

Is there a way to make a “specular only” light?

I tried to use the Light path Is glossy ray mixed with a transparent BSDF but it doesn’t work with a light. It works on an emissive plane though, but that’s making a hell lot of noise that would take forever to refine.

Thanks.

In the lamp’s object panel, go down to ray visibility. Uncheck “diffuse”. Possibly “transmission” and “volume scatter” as well, depending on what you want.

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Damn, that was in the object panel… thanks!