It seems to be phosphor lighting engine mod, I haven't tested this thoroughly yet, I know crash may happen hours into the game, so this needs more testing. At least the game does not crash instantly on before the world loads.
That's a broad array of suspects... Is light in this context a graphics related or just entity that emits light? I guess there aren't that many coremods in my install, I'll try to disable them one by one and launch the game a dozen times. I've done worse, I had to do this more than 90 times when I was troubleshooting the bug in patchouli mod. But I'll probably get my hands on it not sooner than on the weekend/
Do you have any ideas on what coremod this particular this might be related to? Is it one of the graphics mods(optifine, phosphor etc) or are those entities mobsters added by a mod?
The game crashes as soon as I enter the nether dimension. This crash(or at least similar) has been happening at random times in the overworld on forge verison 2835 and after updating to the 2836 I had no issues in the overworld and the game crashes when I enter the nether.
Attaching the log file. Say if you need more information or testing.
latest.log