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Since the beginning VrayLight material has an intensity limitation in Multi-sub/object material.
I have asked for this in the forums
The recommended solution is: detach the sub-element that has that material, activate Direct illumination or convert the object as mesh light.
This is not practical, specially when you have a lot of objects using this kind of material.
I think its time that we can have a better workaround, an improvement for Vray Lightmaterial for this kind of issues.
Other engines like Corona, doesnt have this limitation on its Light material.