I can find lots of papers on Photosynthetic Saturation, Photosynthetic Rates, and many others as they relate to c3 plants. I spent an hour or so yesterday reading them, unfortunately I didn't bookmark them, I'll be looking again today.

The only common theme I can find so far, (that I can deduce from papers written with university speak) is that there are many factors which calculate into what would be considered the saturation point for light in a given plant species. Among them are the things which all cultivators are familiar with. Food, CO2, and Water. The levels of all 3 seem to play a part along with genetics in determining how much photosynthesis can take place.

I can't find much citing specific examples of damage resulting from the oversaturation, most simply seem to claim that it is a point of diminishing return. One abstract did point to oxidation as a culprit for damage, but I didn't really understand the science behind it.

I'm still hunting:rambohead:

BTW Weez, I have seen what you describe with the razor sharp demaceration line as well. I saw it in person on one of Headshake's plants from a past grow. I know he has pics of it too, so I'll see if I can find some. At that point everyone attributed it to genetics, claiming albinoism. That leaf stayed intact for quite some time too from what I remember.