I think zzz is talking about same think I am experiencing. Point lights seem to be very angle dependent. They are visible at any angle under a certain distance, but beyond that distance, sometime 350-400 meters, they are only visible at certain angles, like they are being occluded by a certain parameter. The occlusion/visible angles seem to be very consistent, and I have reloaded the light script after making an edit, and suddenly all of the point lights are visible to beyond 11 kilometers and seem to be working perfectly, until I re-start OT, they are angle dependent again. I think there is a minor glitch somewhere in the point light system affecting visibility at certain angles, spot lights don't seem to have this problem, as they cast light on the ground and objects, that light is visible from any angle.
Regards,
Uriah