BerconNoise - Clamp bump amount?

[Art48]

Hi,

I got some strange behaviour with bercon noise which (at the moment) I think is related to clamping / having negative values.
Is there a way to clamp the bump amount? When clamping via the output node there is no difference. Does VRay treat bump differently in regards to values?

EDIT:
Nevermind - Color2Bump node is my friend.