Lights bleeding through the ceiling.

[Cranky Old Man]

I currently have a level that has 2 floors. I am having this problem where the lights on the first floor are bleeding through the ceiling to the 2nd floor. Are there any ways to prevent this?

Create thicker floors. The same goes for walls, if the lightsource is too close to the wall (because it's turned in the wrong direction).
If you really can't create thicker floors, then I bet that you can turn the radius down to 0 for your lamp, and link it to a point light entity further down.