Help needed with lighting hot spots

[Dave13]

I'm trying to get rid of the lighting hot spots on the ceiling. I've changed the 2 x 4 lighting from standard library 2 x 4 light lighting white material to emissive and shut the lights off for ray-trace. The light showing in the ray-trace are added lights with spot light setting @ 25w. I've tried parallels, point and spot lights all with the same result. The ceiling is a GWB, painted with with a poly-line solid t-grid.  I'm trying to just evenly light the store without lighting hot spots.

Thank you for any advise you can provide.

 

Version 8x