Watts vs. Lumens

I am baffled. There have been several posts saying that using Wattage
as the basis for measuring lighting is a crock. I am sure this is true.
However, each of these posts then goes on to describe the writer's
lighting in terms of Watts with no mention of the lumen output of the
bulbs. ¿Que pasa? How many lumens per gallon are we talking about?
Justin Healy in Cloudy Savannah where my 1.5" female shrimp is about to
scatter God knows how many baby shrimps.