How do I create realistic lighting emiting from a bulb from a lamp I am a noob at blender and I created this scene(work-in-progress), and the study Lamp will be the only light source.

However, the light is filling the room and doesn't look realistic.
I want the bulb in the lamp holder to only emit light at the table(directional) and I don't know how to achieve this. have a look at this image to know what I mean:

The bulb is only emitting light at the bottom and top(since it is open) and no light is emitted like in my image(except soft light)
In a nutshell, how do I make the bulb throw light only at the table, like a spotlight? I want the rays visible.
EDIT: The first is my render. The second is an example image from google to better explain what I want.
With a "point" light as lamp and a fabric texture with translucent shader for the lampshade.



The point light is just a light (as suggested by OldMan in the comments):



The lampshade is composed of a fabric texture and a translucent shader:



"No more"... if you try replacing the point lamp by a sphere, this is working too, but the render is slower and more noisy.