Im not sure why im getting that dark patch
Is the light situated behind any kind of mesh inside the lamp shade?
What dark patch do you mean? Is it the one under your lamps head? On the floor?
That looks like a shadow cast by either a light or a plane with an emissive material that is located somewhere above and behind your lamp.
In your outliner I can see a plane mesh that is hidden in the viewport but visible when rendered. What is that?
You know it’s been so long that I’ve logged back in and started thsi course that I myself can’t see the problem I was highlighting in this Post. Also everything visible in the view port.
personally I think the shadow adds a bit of realism to the shot as it looks like the ring you get in a badly focused light from a flashlight with adjustable focus.