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Re: Lighting and Lux
Lux, or illuminance per square meter, varies dramatically with the distance
from the light source, inversely by the square of the distance, as a matter
of fact. It can almost disappear at the bottom of a deep tank. That's why
20 watts can grow glosso beautifully in a six inch deep tank, and not at all
in a 15 inch tank, both with the same surface area.
It would be most useful to have a table that would show the lux that is
produced by various bulb and reflector combinations, at distances of from,
say, two inches through 20 inches from the light source. I think that would
just about eliminate most of the lighting questions that we see and eliminate
a lot of questions about "how many watts per gallon?" and "what is the best
Has anyone seen such a table? Would it be hard for a knowledgeable person to
construct one? I'd think it could be done either mathematically or
experimentally, the latter with a waterproof lux meter and a flexible neck.