Hiding Spotlight from only 1 camera

I have a game where you can pick up a camera and use it, and it's at night and i want to add a spotlight to the camera view but not the main camera view. I attached a layer to the spotlight for the 2nd camera and changed the culling mask on the main camera to not show the spotlight for the picked up camera, but that spotlight still shows up in the view of the main camera. What am i doing wrong?!