I've watched a lot of videos on mushroom farming, and it's too hard to make an efficient mushroom farm with and without mobs spawning.
It's a lot easier and faster if you just farm wheat, melons, or hunt piggies.
Place torches every third block at 4 blocks above the floor. This will keep mobs from spawning, but still dim enough to grow some mushrooms. Also, make sure it's a pretty big room if you want lots of mushrooms to spread.
Use glowstone about 3-4 blocks above the mushrooms to prevent mobs from spawning
I figured it out!!! Do this except put the glowstone 6 blocks above. This allows the shrooms to spread but prevents mobs from spawning. Thanks for all the help!!!:)
It's a lot easier and faster if you just farm wheat, melons, or hunt piggies.
I don't think you'll be able to plant them if it's in a light area