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**To**:**<Aquatic-Plants at actwin_com>****Subject**:**watts per gal****From**:**"Gordon L. Mc Lellan" <gordon2 at dimension-x_net>**- Date: Sat, 8 Jun 2002 22:25:30 -0400

questions about the whole "watts per gal" idea in tank lighting. I'm not an electrical engineer, a mathematician, or a botanist, so what I'm thinking is most likely wrong, or something like that :) Numerous websites have formulas to calculate how many "watts per gallon" of light you need to grow low-mid-high light plants... The questions I have are: Isn't watts a rather unreliable measure of light output? I mean, a 75 watt standard incandescent puts off as much light as a standard 20 watt cool white fluorescent, or a 13 watt compact fluorescent twist-bulb. Which wattage do the formula's speak of... I assume they mean watts fluorescent (since that appears to be the most popular)? Are there any formula that use something more related to actual light output, like lumens or candlepower? Or formula that are calibrated to the wattage to light output ratio for standard fluorescent bulbs (can't afford the power compacts yet). ttyl Gordon

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