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Re: [APD] light and the w/gal rule
Jerry Baker wrote:
> Well, I used the data at Aquabotanic and it seems that lumen ratings are
> much more highly correlated with PAR than wattage. When you perform a
> bivariate linear regression on lumens/PAR you get an r-squared value of
> 0.96 with a standard error of 14.76, but when you analyze watts/PAR the
> r-squared is only 0.86 with a standard error of 22.6.
Data plots here:
It's easy to see from the graphs that the relationship between lumens
and PAR is tighter than that between watts and PAR.
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