Scene Scale and Low Poly Shadows

[doppelgaengerdigital]

So this is bothering me for some time now.
I work in centimeters in Maya. When I have low poly objects in my scene, like a default sphere with the size of 1 my shadows look correct. When I scale the sphere by 100 my shadows get those polygon shaped shadows, which isn't useful at all.
What is the correct way to get rid of this?
I don't get this behaviour in arnold.

Shadow bias in the light setting?

If yes, is there any global parameter, because I don't want to change this on every light source seperately?

Thanks for help!

[hermit.crab]

Shadow bias in the light setting?!

Most likely.

If yes, is there any global parameter, because I don't want to change this on every light source seperately?!

No, but you can use a script. Select all VRayLights and run this MEL script (where you may adjust the "0,02" value as you wish):

{
string $nodes[] = `ls -selection`;
for ($node in $nodes)
{
string $shapes[] = `listRelatives -shapes $node`;
setAttr ($shapes[0] + ".shadowBias") (0.02);
}
}