Stopping MOBs From Spawning in Minecraft - MCinstructabuilds
Quick Tutorial showing what blocks MOBs can and can't spawn on. Below is a list of blocks and their effects (Let me know if you think they're any I've forgotten):
Light Emitting Blocks:
Torch
Redstone Torch
Glowstone
Redstone Lamp (when lit)
Beacon
Blocks MOBs Can't Spawn on (Height Adjusting):
All Slabs
All Carpets
Chests
Flower Pots
Daylight Sensor
Redstone Repeater
Redstone Comparator
Brewing Stand
Cakes
Fences/Walls
Stairs
Trap Doors (when flat)
Gates (when closed)
Tilled Earth
Blocks MOBs Can't Spawn On (Transparent)
Cobwebs
All Glass
All Leaves
Iron Bars
Water
Lava
Blocks MOBs Can't Spawn On (Redstone):
All Rail Types
All pressure plates
Buttons
Lever
Redstone
Blocks That DO NOT Stop MOBs Spawning:
Banners
Signs
Flowers
Saplings
Grass
String