No smooth lighting in dark places

You can see that in dark places, there is no smooth lighting.

What I expected to happen was:
For there to still be smooth lighting in the dark

What actually happened was:
There was no more smooth lighting

Steps to Reproduce:
1. Go to an extremely dark place
2. Look closely at the walls

In the screenshot, you can see at the right of the picture that there IS smooth lighting, while the left side does not have smooth lighting.