Light problem

Can someone tell me why is this happening and how do I fix it?

 

That looks like a depth buffer precision issue. Try to push out your near clip plane and, if you can, decrease your far clip plane. If this is on mobile, make sure you're using a 24/32 bit depth buffer and not a 16 bit one. You may also need to play around with the depth bias of your directional shadows, as some of the flickering may be caused by them.

 

Thank you very much, the clipping panes were the issue.

 

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