Issue with Lighting on joined meshes

Hey all,

I am having some issues with my lighting. I have created all of the meshes in the scene in Blender for an educational project I am working on, I have now brought them into UE4 and am putting the scene together. Upon building the lighting, (which is made up of a mixture of stationary and moveable point lights) I get no errors (I did at first due to overlapping lights but I have altered the attenuation radius’ accordinly), however this is the result.

The bands of light coincide directly with the edges of the meshes, which I have carefully placed together as accurately as possible. Can anyone offer me some assistance as to why this is happening and how I can avoid this? It may be worth noting that the light was built at “production” quality.

Kind Regards.