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I built a sky mansion, but sometimes mobs spawn inside. Light levels are all above 7 where there are like three or four of them. All other fields are up to 13 light.

It happens very rarely, maybe once every 10 days, but if it's a creeper, once is too much.

Any ideas as to why this is happening?

  • 1
    How did you get the light level - by counting blocks away from a torch, or by F3? I believe F3 shows the light level at your head. – user253751 Aug 23 '17 at 23:23
  • This question is ambiguous in a way that affects the answer. The title says "at light level 7" but the body says "all above 7". Most hostile mobs spawn at light level 7 (or less), but not above light level 7. – JBentley Aug 24 '17 at 10:02
  • there are like three or four of them = there are 3 or 4 blocks that are at level 7, but not anymore, I lit the place up now hope none gonna spawn there again. – Denislav Karagiozov Aug 24 '17 at 11:04
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If the block that they're spawning at is next to a wall, light up the other side of the wall. Grouped spawning mobs only need one of the blocks in the spawn area to be less than 7 to spawn and will sometimes spawn on other sides of walls.

If they are not spawning next to a wall, or the opposite side of the wall is solid and not hollow, check the lighting again - they can spawn at light level 7, but no higher.

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