From #75
"Also, your light gauge seems to pick up on atomicstrykergrumpy's light sources, But it doesn't seem to reflect with actually being able to see the mob."

@tacusin I can confirm that the light gauge is currently pulling block light data from the client and not the server. I plan to change this to properly pull lighting data from the server instead.

Side note: Dynamic Lights does not change the server-side lighting levels, and so DS sight algorithms have no way to properly interact with those lights (nor does any other system from any other mod or even vanilla, unless they did some special compat for that somewhere)