There is... it's called CEA ratings... that is the only standard established to my knowlege. To be honest I'm not sure how they take their measurements. I have seen a lot of people use the .707 method, and to be honest I dont understand why. To be honest it dont really matter to me, I use the readings I get, and that is all I compare to //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif Less math work too //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif