This image is screaming for an area light instead of a point light.
Use a 'circular orient' area light (probably a 10x10 points adaptive 1
should do) which is about the size of the light bulb (well, of the
imaginary light bulb since you probably didn't use a real one but
just put a light source inside the shade).

   Also the shade should have an effect on the lighting. Try removing
no_shadow from it and letting light go through it filtered.

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