custom lighting, how do you normal map?

I use normal blend but it’s giving a soft normal look, even if I switch to object space then convert back to world with the transform node

You’re blending a world space normal vector with a tangent space normal map so it works incorrectly. This setup works for me.

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lovely, thanks, I understand now why you chose tangent.

what i don’t understand is the difference between world and absolute world, this is straight from the office of redundancy office.