I have a scene with a car I have rigged, and for some reason setting camera emission scale to 0 does not make my omni light invisible to camera. However, doing the exact same thing inside a new scene works fine.
Copying the same light that works into the car scene makes it visible to the camera.
Copying the bad lights into the new scene also makes them visible to camera, and after that point if I make any new omni lights in that same scene they also become impossible to make invisible to the camera.
I can 'fix' it by making the shape radius 0.001m, but then I have to increase the multiplier much more. It's just a strange bug that seems to be infecting my one scene.

**EDIT:
I think it is just something to do with reflection on the window glass.
Moving the light around makes it appear and reappear.
It's a strange observation but I don't think it's a bug.

You can delete this thread. Sorry.