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I have recently attempted to create a mob trap/spawner, took me about an hour or so. After making the finishing touches I run to the collection and wait for a mob to drown or whatever, but after waiting a few minutes AWAY from the grinder ( around 30 meters ), I return to notice that the mobs haven't even spawned inside. I thought it was weird, and checked it out inside. I noticed that light was somehow leaking through the walls? I went in and out trying to find this blasted hole... to find that there isn't one. I actually double layered the walls just to make absolutely positive... to no avail.

So after about a week or so I give up after having searched the internet with no luck. I then find a dungeon which was actually one of my first, but had the idea to make it a trap as well. I create a little water trail that leads to the center and that concentrates them to a point to where the would drown in the floor beneath and the current would sweep the ground of their loot. I thought it was a plan and so went ahead, got my water trail going, got the floor beneath all tidied up for the gobs of zombie drops I was going to receive... and found that the exact same problem for the above persisted. Light was on all four sides of my not-so-dark room? What I found interesting though, is that when I had knocked out the cobble that seemed to emit light and replaced it, the light had actually went away, thankfully. But why? There was no holes behind the block, no torches inside the room, and especially not a torch INSIDE the room. But what caused the light to *leak* into my room?

Can anybody give me an answer? I can't even find another topic that suggests someone else has had my problem. Sorry for my extensive and composed paragraphs btw.

I had this same exact problem for my mob system I made. When I made it during the 1.6.6 patch, everything went smooth. It was when they implemented the smooth lighting from 1.8 that makes this happen. So when I went back into my system and lit the place up to do some fixing, all was well until I broke the torches. It seems that if I placed a torch there and break it, it would make random patches of light emit from blocks.

Solution : The only way I could fix this was to break the block that emitted the light. So you have to dig around until you hit the block, and then you'll notice it goes away. You'd have to do this for all the light blocks. So yeah, its a huge pain.

Quote from FayzedNZ

Its a lighting bug where light stays even after a torch is removed, the solution is to update the block where the light is coming from by either removing it and putting it back or placing a block over it then mining it out. (or you can place anything there the block just needs to be updated)

This. The same thing happened to me when I was building a mob spawner in my friends' RPG world. It was lit up like no other inside, but I figured out a solution. Just try to locate the block that is emitting the light. It can be kinda tricky, but look around other blocks and where it's the brightest start placing some blocks around that area, then when you hit the right block it will get dark. Do this for all of those glitchy areas in your mob spawner and you'll be good to go.

Note, after I did this the spawner worked fine, but I went back up inside it later and there was a couple more light blocks left. I'm not sure if this is a recurring glitch or if I missed it the first time, but you might want to check inside it now and again to make sure that it doesn't happen again. Won't hurt to check.

Hopefully they can patch this soon. It is very annoying wasting my time trying to make a dark room without knowing that light is flooding the entire room.

Best way i found is use a bucket of water! Easy and fast to get the block's to update!!

I think 1.4 or 1.5 is going to have the new lighting system which will be, hopefully the last one. So see the fix around new years.

This also rarely happens with water source blocks, its a pain in the butt, though all you do is update it like the rest of these guys have said

Quote from Ben_Fett

This also rarely happens with water source blocks, its a pain in the butt, though all you do is update it like the rest of these guys have said

Rarely happens?? I can't place a torch and not have water stay lit up. Annoying as heck.

@2St0ned How do you use a bucket of water to eliminate leaking light? Just pour the water on the seemingly *infected* block?