Subdivisions Parameters in Vray 3.4

[titti_vi]

I can't find subdivisions parameters in vray 3.4. I would like to improve the quality of the reflection glossiness and the subdivisions of the light source.
Can you suggest how to solve the grainy problems in this render that I attach to you?
I think the problem is in the light coming from the right.
Please help me

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[filibis]

Subdivision (Subdivs) must be under Light Cache settings. But instead, try Denoiser first to get rid of noise. It should be an easier and faster job for Denoiser.