Cycle render noise wont change i have watched many tutorials on how to reduce noise in cycles. however, no matter what i do its still grossly overflowing with fireflies. i must be missing something basic but i dont know what it is. i was watching a tutorial where he put the emitter plane in a hallway and changed its location and size and it made it crystal clear. i tried this and it just makes it worse. i have no idea what i am doing wrong. 

Here is the tutorial i was watching.i was just trying to recreate the first example.
https://www.youtube.com/watch?v=81k22ijYiIw
I see that You set render samples to only 10 but used an emission node.. so I suppose You are trying to get a shadeless material..

the correct node setup for this kind of result is this:



don't really need for a 100 emission size, just 1 to 3 ^^

If You are trying to reach a different kind of result so... raise up your samples to 200 up to 1000 to archive much better results in cycles :)