Don't know if this is a bug or what but very often when converting vray materials self illumination is "ON" with value 1. its not visible but you end up with thousands of light sources depending on geometry.
Recently had an issue where the scene kept crashing with memory leak a few minutes into rendering, after many hours of troubleshooting boiled it down to a whole bed scene from 3dsky converted from vray had self illumination turned on. problem solved after turning self illumination to 0 in all the materials manually. both in corona 7 and 8
If anything is could it be possible to add force self illumination to 0 checkbox in the corona scene converter?