answered on the first post. its fluorescent. maybe start a new thread explain what you have and what you want to do and they will be able to better explain it.
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As stated, Watts and gallons are not the only required inputs. The WPG formula is worth just as much as the inch per gallon IMO. Nothing. There are no "types" of wattage.
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and this is 100% right there are so many factors in lighting and many other things.