Mobs spawning on my f7 checked lit room

[rosedragon]

So I have a big house that was mobs-free, but then suddenly zombies spawn in it. I checked with f7 (NEI light checker) and there is no X mark anywhere from ground, cervices, and above blocks.

First floor is where I put blood magic altar and well of suffering, second floor is machineries such as IC and AE2. Basement is unfinished big hole and 5 blocks height dark room with cursed earth floor for my altar.

Could any of the mods causing mobs to spawn? Thanks!

 

[HeroWing2]

Use the magnum torch
It will keep any Mobs from spawning exept cursed earth so perfekt for you

 

[rosedragon]

oh I was afraid it going to prevent the cursed earth o.o good idea!

 

[GreenZombie]

So I have a big house that was mobs-free, but then suddenly zombies spawn in it. I checked with f7 (NEI light checker) and there is no X mark anywhere from ground, cervices, and above blocks.

First floor is where I put blood magic altar and well of suffering, second floor is machineries such as IC and AE2. Basement is unfinished big hole and 5 blocks height dark room with cursed earth floor for my altar.

Could any of the mods causing mobs to spawn? Thanks!

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If you have a mob farm somewhere, dark room, cursed earth, whatever, my experience is that a zombie being damaged in the dark room, can sometimes spawn a re-inforcement elsewhere, in a well lit, area of my base.

At least its just zombies not creepers.

 

[rosedragon]

Aha..! so that is why my base is under attack.. I put the whole cursed earth toooo close to my first floor :O ...
Thank you Chris!