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Erik's Light Survey

>I'm considering setting up an old 75gallon tank as my first attempt at
>a DIY medium-tech tank. Erik's article is very timely for me. :-) I
>have a question about using Watts as a measure of light,
>though. Specifically I wonder how things differ between using T12s and
>T8s. The T8s have a lower wattage, but can possibly produce more
>lumens. Do I just fudge and say any 4' fluorescent bulb is 40W/bulb
>and go from there? Do I use the correct wattage for each different
>bulb? Do I need to care?

I can tell you what I do, and tell you that it works.  I'm sure other
people have other ways of guestimating!  When figuring the approximate
number of tubes I'll want over a tank, I use the 3 w/g estimate based on NO
T-12's.  Then I use the same number of comparable energy efficient T-8's.  

Karen Randall
Aquatic Gardeners Association