I am wanting to place the Rect Light in my scene to shine down from tube lights, but it’s shining in all directions… why is this? I have played with loads of settings and nothing seems to make a difference.
Welcome back ryan-olford4988, its great to have you here.
One of the first things I would check is if any IES texture values are set in the rect light.
If there aren’t any, then I would check your attenuation radius. I was able to reproduce the same effect when I altered it on my end. Lowering the Intensity also helped me alleviate the issue as well.
I would also try rotating the light along the Y axis as this also helps me not have the appearance of a double light.
I hope this assists you with your rect lights.
I dread to think how long its been before my reply 
I’ll head back the that project as I still have it saved (I recognise the floor tiles lol) and will get back to this post. Thank you in advance