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I can't be the first person to have this issue but I can't seem to search out a solution. I have a large box that I'm building in. About 100x100x20. I have glowstone all around the perimeter and I also have the room grided out so I have lines of glowstone every 10 blocks for the length and width of floor. I also have glowstone on the walls at 10x intervals at the 7 and 17 mark up the 20x wall. Suffice to say I would think this is a lit space.

I still get spawns, and not only do I get spawns but if I am across the room up high looking down the ground is in shadows... not dark just darker that I would expect. If I move over to the location it typically takes a couple of seconds for the 'light' to pop and brighten up the area.

I don't have a slow computer but is this just lag or something else? Its pretty consistent if I am some place in the room the lights dim in the farthest location away.

help? thanks.

EDIT: Version 1.2.5

p.s.

Don't know if it factors into things but the building splits 3 biomes. It's a flat creation but I have desert, grass and snow. Actually there is a diagonal swatch of snow that cuts thru the building from corner to corner. I can have desert , snow storms and then grass and rain all within a couple of steps.

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Light every two steps seems excessive - have you tried fewer glowstones? Perhaps there's a limit to the number of light sources that get applied. –  David B Jun 4 '12 at 15:56
    
I've seen this happen often with the new lighting engine. Usually it'll update the light if you temporarily change the light on that block. For example, remove a few glowstone blocks then replace them. Unusual amount of unlit blocks, however, so this may be nothing more than conjecture. –  Domocus Jun 4 '12 at 17:39
    
Originally I had alot LESS blocks in place, that was when I noticed the issue originally and then I went overkill and it didn't change anything. I was thinking it was something to do with the rendering of the engine. I'll try changing up the pattern some or try torches to see if it has the same effect –  Christopher Klein Jun 4 '12 at 18:48
    
How close are you to bedrock? –  gnovice Jun 4 '12 at 19:15
    
flat/creative mode so pretty close... whatever it is 5/6? –  Christopher Klein Jun 4 '12 at 19:20

3 Answers 3

You can press F3 to bring up the debug information, there is information regarding the light level of the block your head is in. So you need to keep it above 8 (so the floor is above 7).

Debug screen The number you need to pay attention to is rl (real light) as long as this is high enough mobs cannot spawn.

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very useful, didn't know that. Still, what does it have to do with a large shadowy section in an area almost filled with light sources? –  Christopher Klein Jun 4 '12 at 18:49
    
@SomeMiscGuy I'll help you find the areas that are spawning the mobs... –  Ronan Forman Jun 4 '12 at 20:25
    
OK, so stupid question of the moment, since the pattern of light is diamond shaped do glowstones with only their tops showing just not give off enough light? –  Christopher Klein Jun 5 '12 at 0:42

If preventing spawns is your main objective, and you don't mind it looking a bit dark, you can lay a floor of half-slabs. This will prevent mobs from spawning at all, regardless of light level.

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the best thing is to do floating torches,rather a block with a 5x5x5 radius so its in the middle of a 5x5x5 cube and put torches everywhere but the bottom with a 5x5x5 cube around it and the half slabs thing is true

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