[APD] Re: how much light

[Dgrim62 at cs_com]

Thanks for the substrate/water example George. I guess I should have said 
that water in the substrate is similar to water in the sump, not part of the 
water volume in the tank that is being lit, and therefore doesn't have a part in 
calculating true watts per gallon.

Sounds better to me! :-)

Dave 
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