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Old 10-16-2012, 06:57 PM   #8
somewhatshocked
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Watts Per Gallon is no longer really a thing - especially with modern planted tanks. The reason? Please refer to lighting stickies for details about PAR.

The reason, in short: 26watts of CFL lighting directly over a 10gal tank is way more light than that same 26w bulb would deliver if suspended three feet above the tank.
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