Minecraft wiki entry for Light, associated text: In the Nether, sky lighting doesn't play a role since there is no source of sky light (although if there were, it would reach about 99% brightness.[luma 1]) Full darkness with the "Moody" brightness setting is at about 25% brightness,[luma 1] slightly darker than a block light level of 7 and no sky light in the Overworld, and is shaded orange like block light.