[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

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.

Jerry Baker
Aquatic-Plants mailing list
Aquatic-Plants at actwin_com