Hey everyone.
Here is my lamp with worn edges on the base. On the lampshade I don’t have very much “edges”, so I decided to not add any MixRGB or such stuff. Instead I switched the Shader to a Glossy BSDF which gives already a very nice look 
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That looks really good. I was having a lot of trouble with the “worn edges” showing up. I did the example with the monkey head Suzanne. I ended up having to have contrast at 100 and brightness at -2.8 for it to show properly. The video from the lecture doesn’t show what the values are in my browser because it is too blurry. I really like your lamp. I also chose the glossy bsdf but with a red color. I am still working it out.
Hi.
The contrast value really hat to bei very high dir the monkey example. Regarding the blurryness of the video: maybe the Automatic quality mode of the Video Player ist turned Off or Something like that. Check your settings there.