Overdriving lights.
the Algae in the corals use the same wave length as plants (and a bit lower) plants the usefull is about 420 to 680nm the PAR meter I am interested in is from 350nm to 700nm, but from what I have been reading, the PAR used by corals mostly is the 350 to 450 range, but that is only deep water coarls.. shallow water coarls will probably still use the full PAR range as they get full light at the shallow depths not filtered to the degree that most people simulate in there tanks. but it does look cooler [img]images/smiles/icon_biggrin.gif[/img] . So far everthing I read say PAR is the most important measurment of light on a reef and it is also a measurment that holds true no mater which bulb or ballast or how much power you are trying to put through the light.
Steve
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