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Originally Posted by MalHavoc
The point is, watts don't really mean anything (they never have, actually). And yes, it is meaningful - compare the PAR values at play here, which is all that really count anyway. Examine the system with 4x96w power compact bulbs - initially, it has less PAR than the 13 watt LED set up, but penetrates far deeper and the PAR rating at the bottom of the tank is higher than that of the LED.
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Though you may be perfectly correct in your comparisons of PAR for 13w of LED to PAR for 4x96w PC, I will only accept the results when 13w of LED are compared to 13w PC in the same tank, or when 384w of LED are compared to 384w of PC in the same tank. I still sounds like comparing apples to oranges to me to compare such vastly different amounts of light to each other.