Monster spawner blocks continue spawning with Torch

Are blocks in the spawning radius (approximately 8 blocks wide, 8 blocks deep, and 4 blocks high) at a light level of nine or higher? If not, than mobs will continue to spawn.

You have to provide more information. Mobs have different rules of spawning from spawner block.

Umm if you were to find a Dungeon and then place a torch on top of the spawner it will continue spawning even the though the light level is 10 from the torch.

Its been a bug since 0.9.2

Place a torch on each and every side of the spawner and try again.

Place down a Spawner and place a torch on top it will continue spawning.
Unlike PC