so your original post is low light. The problem with that is that low light requires more nuiances in rendering such as RT shadows and screenspace shadows and reflectinon,
The difference is that our game is like ALL fast paced games with large range of lighting like PHG, Destiny, Ghost Recon,etc.
What low lighting entails is lots more attention to details. Think Alan Wake2. Alien Isolation.
The lighting is very much nuanced. Meaning alot less natural lighting, and more shadows come from elements in the ROOM. Think Callisto protocol. Small ambience coming from LED screens, light bulbs, candles,etc.That requires more rendering power.