well take a 40 gal tank and a 40 gal breeder tank for example
a regular 30 gal is 36" long and 12" wide giving you 3 square feet of surface area (or if you prefer bottom area)
a breeder 30 gal is 36" long and 18" wide giving you 4.5 square feet of surface area
a 30 gal X-high is 24" long and 12" wide giving you a surface area of 2 square feet.
so as you can see the same light on each of these tanks could have a much different high requirment to spread it out evenly over the tank. also the different hight on these tanks is going to give you a very different intensity reading at the bottom of the tank. so while we have all these differences the watt/gal is identical on each of these tanks.
Steve
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 *everything said above is just my opinion, and may or may not reflect the views of this BBS, its Operators, and its Members. If cornered on any “opinion” I post I will totally deny having ever said this in a Court of Law…Unless I am the right one*
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