Here’s my take. I wanted to bend the arm about 2/3 of the way but couldn’t figure out how (and couldn’t remember from when I took the Blender Basics course a few years ago).
very basic street light but the shadow is wrong,
want every light I used the shadow did this, The light is on the bottom of the cross bit.
I have try moving it around but …
Looks like your lamp type might be a sun lamp.
Switch or to a point lamp and it should be fine