Right - My interpretation was that after reaching photo saturation - the curve was relatively flat - and then at much higher PAR values damage occurred. But - that there was still a great variety of tolerance between the photo saturation point and where it seemed like light was 'detrimental' to the coral. Ie. if the photo saturation point was 150 - damage didnt start occurring at 160? Can you comment on flow and alkalinity vis a vis this topic?I don't think I've posted this info before = photosaturation points for various corals. Bear in mind that the light intensity required for saturation decreases as depth increases - this accounts for some of low values seen in some of the Acropora species. The high value seen (Porites lutea) was from a purple shallow-water specimen. The only super high value seen was in Tridacna clams - give these guys as much light as you can.