Having a problem with lighting a large area
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.
Solution 1:
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).
The number you need to pay attention to is rl (real light) as long as this is high enough mobs cannot spawn.
Solution 2:
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.
Solution 3:
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