How far do I have to place torches so that mobs will not spawn near me?

Since torches prevent mobs from spawning, is it possible to place enough torches within a specific radius to ensure safety during the night? I’m thinking of a situation without any shelter built, more along the lines of a flat plain. If it is possible, how many torches/how far out do I need to go to make that area safe?

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  • 4 Solutions collect form web for “How far do I have to place torches so that mobs will not spawn near me?”

    1. Learn about light:

      • Sunlight gives 15 luminance to the blocks it hits directly, or through half steps.
      • Lava gives 15 luminance.
      • Lightstone gives 15 luminance.
      • A jack-o-lantern gives 15 luminance.
      • A candle gives 14 luminance to the otherwise empty block it occupies.
      • A redstone candle gives 7 luminance to the otherwise empty block it occupies.
      • Every tile that isn’t a light source has a luminance of one minus the luminance of its neighbors. For example, if you had a 6 and a 4 luminance sources close to each other, attached to a wall, you’d have this distribution:

                    1
                   121
              1   12321
             121 1234321
            1232123454321
           123432345654321
            12┴─────┴4321
             1     12321
                    121
                     1  
        

        …except this works in three dimensions instead of two!

    2. Learn about spawning:

      1. The following applies to any difficulty, except for Easy.
      2. Every tile within 24 distance of the player is not eligible.
      3. Every tile outside a 144×144 square centered on you is not eligible.
        • Every non-glass, non-half step surface in the outer world with 7 or less luminance is eligible for spawning.
        • Every non-glass, non-half step surface in the Nether is eligible for spawning.
      4. Mob spawners cause mob to spawn at a high rate in any surface within 5 distance of it.
    3. In practice:

      Here’s what I try to do to ensure a luminance of 7 consistently along a line:

      1. Place the first torch. Pardon my hexadecimal one-sided luminance graph:

        EDCBA98765432100000000000000000
        ↑
        
      2. Proceed until you find two tiles looking exactly like the next, then go back one.

        EDCBA98765432100000000000000000
                     ↑
        
      3. Plant a torch there. Lo and behold, minimum luminance there will be 8!

        EDCBA9889ABCDEDCBA98765432100
                     ↑
        
      4. GOTO 1

      You can adapt this algorithm to your necessities with ease. Just plant a torch in the darkest area when in doubt. (Duh.)

      Also:

      • Put torches directly onto surfaces for best results.
      • In your mining, be aware that any surface is good enough to spawn…

        ↓↓↓ ↓↓    All positions marked with an arrow are valid
        ███ ██↓   spawning points, to the best of my knowledge,
        █     █↓  and they all can lead to the just spawned mob
        █      █  to reach you.
        █     ↓█
        █↓↓↓↓↓█   Be vigilant and don't mine caves from the
        ███████   bottom up :(
        
    4. Learn how to keep mob that has spawned outside: make traps.

      • Mobs can only jump up one tile. Make pits deeper than that and, once in, they will be trapped (skeletons are still dangerous and spiders can climb out).
      • Mobs cannot deconstruct. Make walls. (Be aware creepers do explode, if they get close enough.) Use cobblestone: they have high explosion resistance and can’t catch fire.
      • Mobs cannot use items. Protect your entrance with a wooden door. Plant it from the outside, or skeletons will be able to hurt you with their arrows!
      • Mobs’ path finding is somewhat dumb. Protect your spawn point with water and liberal amounts of cactus (arrange them in a chequered pattern.)

    Torches Provide a light level of 14. Note that this is to the block that they are in. Adjacent blocks have a light level of 13. Mobs require a light level of 7 or less to spawn.
    This means that mobs can’t spawn within 7 of a lit torch. So placing a torch every thirteen tiles will keep a hallway lit.

    T____________T
    01234567890123   
    

    You can expand this to two dimensions by placing a second line of torches 7 to one side and offset by seven.

    T____________T______
    ____________________
    ____________________
    ____________________
    ____________________
    ____________________
    ______T____________T
    

    See this post

    First, some mob spawning science:

    • Spawns occur in a 144×144 square around you (assuming a perfectly flat surface), but not within a 24 block radius of you.
    • Hostile mobs spawn at light = 7 or less
    • A torch provides 14 light to adjacent blocks and one less light per block of distance.

    Using these measurements, it looks like you would have to make a grid of torches 13 squares apart that covers a 144×144 block area (excepting the no spawn circle around you, if you like).

    Mobs will spawn in areas of light 7 or lower. Source

    Torches provide a light of 14, with the light value being reduced by 1 for every tile away.

    14   13   12   11   10    9    8    9   10   11   12   13   14
    

    Consider the line of light values above. The 14’s are torches. If you put the torches no more than 12 squares away, you will prevent any monster from spawning in a straight line; do note however, that if you go with a strictly grid based system, you will have dark “centers” made from the torch squares. I recommend a staggered grid, each line “shifted” 6 squares from the other, so that the light values prevent the centers from getting to dark.

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