10-19-2010, 12:20 PM
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There's not really any good way to measure light...
Measuring lumens, as I said earlier, takes into account the sensitivity of the human eye.. If lumens itself isn't a true measure, then lux isn't any better, since they are both photometric units.
Lux is basically Lumens per square foot- (brings me into the square law, but won't get into.)
There was a group on facebook a while back trying to lobby the light manufacturers to use.
There are several Radiometric units of measurement, but the light companies only use one-
Irradiance is a good way to measure light intensity- it's measured in watts per square metre, W·m^2, but it becomes madly complicated when you're trying to add up water into the equation...
Regarless, that's probably how watts/gallon got started... It's just as flawed though.