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In vanilla minecraft mobs don't spawn if the light level of the block is 9 or above. However, I often don't want to fully lit all my structures. I might want a courtyard or a cellar that isn't fully lit. Also controllable light systems with redstone are a lot of fun to make, but I can never turn the lights off in fear of spawning mobs.

Is there a mod or another solution to have both unlit places and no mobs around? Maybe some kind of block that prevents mobs from spawning within a radius.

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up vote 13 down vote accepted

Not counting mods, the best way I know of is to make sure the area you're "protecting" has a floor made of blocks which don't allow mob spawning.

Any transparent block will do the trick, such as glass or snow, and in your case maybe Slabs will be most suitable.

For more in-depth information about spawning and spawn conditions, check the wiki: http://www.minecraftwiki.net/wiki/Spawn#Mob_Spawning

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I never knew slabs didn't allow spawning on top of them. That will work in most places. Still hoping for a solution for floors that cannot be made out of slabs or other transparent blocks, but as there doesn't seem to be any, I will accept this answer. –  Phatency Mar 29 '12 at 7:42
    
hmm this make me curious, If you place 2 slabs on top of each-other do they still allow mob spawning? or do they count as a solid block and the rule does not apply? –  Marco Geertsma May 3 '13 at 13:45
    
@MarcoGeertsma They count as a solid block. In fact, the "top" half of a slab, even by itself, counts as a spawnable surface too. –  SevenSidedDie Nov 11 '13 at 2:05
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Maybe you can just set your difficulty to peaceful? Mybe you can just type /difficulty peaceful and then only in that world it'll be peaceful. So mobs won't spawn and in other worlds they will spawn.

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