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Re: Light Requirements - Historical


In the 1948 edition of "Exotic Aquarium Fishes",  Wm. T. Innes suggested that 
a 10 gallon tank get 40 watts of incandescent light for 8 hours or 75 watts 
for 4 hours.  A 25 to 50 gallon tank needed 75 watts for 8 to 10 hours.

He also was greatly in favor of using natural sunlight to the fullest extent 

We have moved well beyond that now, but it seems to me that those of my 
low-tech tanks that receive natural sunlight do better than those that get 2 
WPG of high quality fluorescent.