Noise Problems I'm not able resolve

[sirenesoong]

Hi,
sometime I have lots of problems with noise that I'm not able resolve.

Please, look this images:
first MCT with 4000 samples
seconds Path Trace with 4000 sample
and then I converted all to another render.

Can someone help me? Thanks you very much!

[ciboulot]

Quick question:

Are you using a geometry or an octane light?
What I found out is that OCtane resolves the lights much faster when you put an IES file to configure it.
Is there multiple lights and what are their sampling rates?
You have to tweak this ones to find the best tsetting possible.

Maybe it is that, maybe not...

[sirenesoong]

are all Geometry and I tried different sampling rates.
Now I try with IES.
Thanks for youe time. I'll post here the result.

Thanks and see you
Gianmarco