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It seems that we need some way to measure "effective" illumination, that is,
the amount of light that reaches the bottom of the aquarium.
I thought that lux did that, or came close to it. Does it? Is there a
formula that can compute lux based on wattage and the distance of the light
source from the bottom of the tank?
Maybe some kind of measurement could be developed that would be an
improvement over watts per gallon, and maybe it could start here!