What does "Cutoff" do in VRayLightMTL?

[Morne]

Hi all

What does "Cutoff" do in VRayLightMTL?
It's not mentioned in the help section on spot3d.

[bardo]

From online manual about VrayLight
"Cutoff - this parameter specifies a threshold for the light intensity, below which the light will not be computed. This can be useful in scenes with many lights, where you want to limit the effect of the lights to some distance around them. Larger values cut away more from the light; lower values make the light range larger. If you specify 0.0, the light will be calculated for all surfaces."

I think it's the same.

Edit: I think cutoff works if you check "direct light" in VrayLightMTL, otherwise I suppose it doesn't influence GI calculation