Wayne Sallee wrote:
Obviously the total light output (as long as it's a quality spectrum) is
better than watt's per gallon, but no bulb gives that information.

Lumens is a start, but it falls short, and if people are told to get a
number of lumens per gallon, then people will discount actinics, as they
have low lumens output.

1 lux is 1 lumen per square meter, so lux has the same flaw as lumen.


It shares ONE of the same flaws, being that it is specific to visible
spectrum.

However, LUX still has the advantage of being a measure of the visible
light falling on a particular area, and therefore would be vastly
superior to lumens for figuring out if there is enough light for a
particular organism.