How far should I place torches in a planar huge room?

I’m building a very large planar room. How far should I place torches from each other, in order to avoid mob spawning?

In How far do I have to place torches so that mobs will not spawn near me? question, a lot of details are mentioned, but there is no specific answer about how to distribute torches over a large plane. That’s why I’m asking it here.

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  • 3 Solutions collect form web for “How far should I place torches in a planar huge room?”

    If you want to optimize your torch consumption, I think the best pattern would be this :

    Torches

    • Oranges dots are torches
    • Yellow dots are sufficient-lit blocks
    • Gray dots are insufficient-lit blocks, where mobs can spawn

    Torches create light of 14 in the block they are in, all neighboring blocks will have light of 13 and so on.

    Enemy mobs spawn at light level 7 or less

    Placing one in each corner and two in the center covers all the places.

    XX XX XX XX XX 08 XX XX XX XX XX XX XX XX XX XX 08 XX XX XX XX XX 
    XX XX XX XX 08 09 08 XX XX XX XX XX XX XX XX 08 09 08 XX XX XX XX
    XX XX XX 08 09 10 09 08 XX XX XX XX XX XX 08 09 10 09 08 XX XX XX
    XX XX 08 09 10 11 10 09 08 XX XX XX XX 08 09 10 11 10 09 08 XX XX
    XX 08 09 10 11 12 11 10 09 08 XX XX 08 09 10 11 12 11 10 09 08 XX
    08 09 10 11 12[13]12 11 10 09 08 08 09 10 11 12[13]12 11 10 09 08
    XX 08 09 10 11 12 11 10 09 08 08 09 08 09 10 11 12 11 10 09 08 XX
    XX XX 08 09 10 11 10 09 08 08 09 10 09 08 09 10 11 10 09 08 XX XX
    XX XX XX 08 09 10 09 08 08 09 10 11 10 09 08 09 10 09 08 XX XX XX
    XX XX XX XX 08 09 08 08 09 10 11 12 11 10 09 08 09 08 XX XX XX XX
    XX XX XX XX XX 08 08 09 10 11 12[13]12 11 10 09 08 XX XX XX XX XX
    XX XX XX XX XX 08 09 10 11 12[13]12 11 10 09 08 08 XX XX XX XX XX
    XX XX XX XX 08 09 08 09 10 11 12 11 10 09 08 08 09 08 XX XX XX XX
    XX XX XX 08 09 10 09 08 09 10 11 10 09 08 08 09 10 09 08 XX XX XX
    XX XX 08 09 10 11 10 09 08 09 10 09 08 08 09 10 11 10 09 08 XX XX
    XX 08 09 10 11 12 11 10 09 08 09 08 08 09 10 11 12 11 10 09 08 XX
    08 09 10 11 12[13]12 11 10 09 08 08 09 10 11 12[13]12 11 10 09 08
    XX 08 09 10 11 12 11 10 09 08 XX XX 08 09 10 11 12 11 10 09 08 XX
    XX XX 08 09 10 11 10 09 08 XX XX XX XX 08 09 10 11 10 09 08 XX XX
    XX XX XX 08 09 10 09 08 XX XX XX XX XX XX 08 09 10 09 08 XX XX XX
    XX XX XX XX 08 09 08 XX XX XX XX XX XX XX XX 08 09 08 XX XX XX XX
    XX XX XX XX XX 08 XX XX XX XX XX XX XX XX XX XX 08 XX XX XX XX XX
    

    [13] = Torch
    XX = Spawning available
    Numbers show the lowest light level in that area

    This can only work in a three high or shorter room with all torches on the middle row

    I find it easier to just place torches every 8 and use the (x,z) coordinate mod 8 = 0 as guide. That ends up putting torches (0,0) (0,8) (0,16) etc. When it comes to hillsides, i.e. 45 degree slopes or 1 block rise for 1 block of run, I put torchs twice as often or at coordinates congruent 0 mod 4.

    Note that recently (since summer 2012) I’ve noticed mosters still spawning in what should be light > 7 locations. This is annoying and I suspect an (undocumnted on wiki) change to mob spawning rules. 🙁

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