In article ,
the watts per gallon does sound outrageous, but I don't see it as too
bright. In one tank some dwarf sagitaria does really well, in another
anubius grows about normally (slow), java moss survives, Echinodorus
tenellus barely lives and algae grows, but not too badly. There must
be a scale factor working here, but I don't understand it.

Watts per gallon is a rough metric. Watts of energy going in
does not always produce the same lumens or lux (quantity) of
light coming out, and the shape of the bulb and and type or absence
or a reflector also matters.

What is significant is aht emount of light measured at the gravel.
And old photographic light meter in a plastic bag can measure this.

Small tanks and small bulbs are really a boundry condition for the
"watts per gallon" ruls and forumulas, especially imprecise ones
don't work well at boundry conditions.

Sounds fine to me.

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