"Why is this the lummen (forgive my spelling) output in reality the 150 is 2-3 times more lightout output depening on bulbs. Alot of people lately have also messuring how good a bulb is also by the par which is just how much uv radation is being put out."
I agree that watts is not a good unit of measure for determining lighting efficiency. However PAR is a better measurement of light for corals then lumens since the lumen scale has been adjusted to please the the human eye, which makes it heavy in the yellows but low in the blue and reds. PAR only measures light between 400 and 700 nm which is above most of the ultraviolet wave lengths. All of the colors on the PAR scale are tried as equal. A bulb rated high in PAR, typecially is better for coral growth.
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