Can I use an HDRI for reflections only, and not have its light affect the scene? I have my scene perfectly lit without the use of a HDRI, however I would now like to add one just so I can have some world reflections in my glossy objects. I can't seem to get the HDRI reflecting in my objects without it also adding light to the scene, though. Is there any way to use an HDRI solely for reflections, and not have its light also affect the scene? I am using Cycles.

Thanks
Sure, you need to go into the Properties panel > World > Ray Visibility, and deactivate Diffuse.