I have been trying to fix this for a long time, and have not found one working solution.
And, yes, of course my pointlights have ‘shadows’ enabled.
Help is extremely appreciated, since this looks pretty bad, and I would like it to be fixed.
Thanks!
This happens even when your walls extend past the edges of the other walls?
Try placing a dark block around the outside of the wall and see if that helps.
This is a strange bug, Try clipping the walls into the ceiling and floor a small amount.
The leak might be caused by an extremely small gap that isn’t rendered.
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That actually made MORE leaking! Weird!
You could set your lighting technology to ‘future’ – it’s not perfect but it’s probably the best solution there is that I can think of. After that just make sure your part’s shadows are on and play around with the lights a bit more to your liking 
I’m actually using future lighting at the moment.
Oh lord I’m completely blind 
I’m honestly not sure then, I tried it in one of my studios and it’s working just fine:
I figured out something SUPER WEIRD. When I delete long range emission, then put it back, the glitch is no longer. But then, it comes back in a few seconds. Really odd. Watch the video!
Oh, and here’s the RBXL file:
lights.rbxl (43.6 KB)
Yes. It seems to happen no matter what.
I found it out: whenever I have 2 pointlights in one part, it starts to get glitchy.
Why did you have two lights in the same part?
Since I’m using future lighting, I wanted a short range light so that it would light up places around it brightly, and then a long range light that would light up the rest of the room at a less bright level. I hope this made sense 
It did, but yes you should use separate parts regardless of the glitch so that you can resize the lights separately anyway.
figured this out, roblox doesnt allow 2 pointlights within the same position (0,0,0 relative to a part) to cast shadows, one of them wont cast shadows
Very interesting. I’m glad I know the actual reason behind this. Thanks!
