Literally none, because Rot Lop Fan, the F-Sharp Bell can't comprehend the very concept of darkness - "In untranslateableuntranslateable, in untranslateableuntranslateable.... No evil shall escape my untranslateable" as the ring translation ended up.
If it was only the colours that were the problem, he'd be fine, it's more that the ghastly horrible zombie things would still be there...