Minecraft wiki entry for The_Nether, associated text: The Nether has no daylight cycle and no weather. Natural sources of light include fire, lava, portals, shroomlights and glowstone. Even with a light level of 0, the Nether has a dim ambient light (roughly equivalent to light level 8 in the Overworld). Light otherwise functions exactly the same as it does in the Overworld and the End.