Error With Light Render

morning

can someone please tell me why all my lights are rendering like this

Attachment 91436

many thanks

What settings are you using? I'm not an expert on rendering with Revit, but this looks like light leak, which is usually caused by insufficiently settings. In other programs like V-Ray it would be controlled with some of the sampling parameters. Looking at the Revit render settings, my intuition would be to increase the Indirect Illumination settings, particularly the precision setting.