Thanks for the clairification, and all the guidance. Did manage yesterday to get the new light hung successfully from the ceiling which is currently about 8" from the surface. Can't say I'm not tempted to turn all 4 lamps on instead of two, but will resist the temptation. Still have the atomizers coming and looking at a new reactor possibility as well to see about getting the Co2 distributed faster (or at 30ppm at first light). Will update on any progress.