"Dan Norgard" wrote in message
...
It would seem to me that the depth of the tank would be the determining
factor in lumens, not the gallons. ie: a 24 inch deep tank would require
more light than an 18 inch deep tank even though both were 40 gallons.
Anyone agree or am I all wet? Excuse the drawing...


As usual, YMMV. Just like the "one inch of fish per gallon" rule, it's just
a helpful guidline. And yes, you're correct. A very deep tank may require
more light than a shallower same-volumed tank.