So I use optifine and when i go in my tardis its all dark besides the console

some shaderpacks are a bit temperamental with the mod, try switching to a different one and see if that fixes it. this is an optifine issue so theres nothing that we can do to fix it. 

The light alternator adjusts the gamma in the interior, but it doesn't affect shaders whatsoever.

Shaders still need actual light blocks.