Hi,
A 30 inch deep tank requires only 3.3 percent more lighting
"intensity" than a 12 inch deep tank? That is very counter-intuitive. Can you supply a reference?
I think that WPG is of value only because it is easily calculated. A better number would be lux measured at the bottom of the aquarium. Lumens is a measurement of light energy emitted by a source; lux measures light received and varies with the square of the distance from the source. See
http://www.aquabotanic.com/lightcompare.htm#S-2.
I have always had trouble growing plants like vallisneria in a 2 wpg low tech 16 inch tank. The same species grows like the weed that it is in a 2 wpg 10 inch tank.
Good luck!
Bill
A 30 inch deep tank requires only 3.3 percent more lighting
"intensity" than a 12 inch deep tank? That is very counter-intuitive. Can you supply a reference?
I think that WPG is of value only because it is easily calculated. A better number would be lux measured at the bottom of the aquarium. Lumens is a measurement of light energy emitted by a source; lux measures light received and varies with the square of the distance from the source. See
http://www.aquabotanic.com/lightcompare.htm#S-2.
I have always had trouble growing plants like vallisneria in a 2 wpg low tech 16 inch tank. The same species grows like the weed that it is in a 2 wpg 10 inch tank.
Good luck!
Bill