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lumen per liter

Rod Hanks asked in apd696:

"The old formula of watts of flourescent light (2 to 4 watts per 
gallon) is breaking down, since newer bulb types have different 
watts-to-light ratios.  Is there a rule of thumb based on lumens? "

my response :

Yes there is, although not so well known in the US. In the book "The Optimum
Aquarium" by Kaspar Horst/Horst Kipper (founders of Dupla) recommended a
range of 30~50 lumen/liter depend on low or high light plant.

Hope it helps.


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