How dark was it going down the tunnel in the hobbit?

In "The Hobbit," the tunnel leading to the dark and mysterious realm of Mirkwood is described as being very dark, with little to no light filtering through. The characters experience a deep sense of foreboding and disorientation as they navigate through the pitch-black passage. The darkness amplifies their fears and highlights the dangers that lurk within the depths of the tunnel. Overall, the oppressive darkness serves to enhance the sense of adventure and peril in their journey.