Cool Jason! Thanks. Hey i'm no professional, just things i've picked up. I think what I was trying to say is that lux(basic measure of lumens) on a clear day around 2:00 is 120,000lux at the water surface. As you decend down to around 15feet the irradiance drops to about 20,000lux. Light that reaches the corals below usually exceeds the saturation rate for photsynthesis.
In a nut shell, light is measured in two ways:Lux and kelvin(color temperature).
Feel free to add Jason or anyone else! Always trying to learn _________ 125gal.w/Mag9.5 return(dual megaflow)>Mag7 pump Aqua Cev180skimmer.Wave2k Hamilton Reefstar(2)250watthqi(mh)pend.a Yellow, Naso Tang Red Lip Blenny Percula Clown Demoiselles Niger Trigger F. Wrasses Ceriantharia Orn.Shrimp and Stars Hermits Queen Conch asst. snails> Stars Zoos shrooms Montipora Brains Gorgonians Favia Turbinaria(large+small polyp) Acropora Xenia Tridacna (CroceaMaximaSquamosa) Leathers <35+75gal.reef tank as well> 
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