In the basics thread on RC, srusso brought up the scrubber PAR vs DT PAR. I'm sure he'll jump on here but he is having a bryopsis problem in his system. He increased his DT lighing significantly and now his scrubber is essentially being out-performed by the display tank lighting.
Regardless of that, it brought up an interesting concept. Is there any type of correlation between how powerful your DT lighting is compared to how powerful your scrubber is? For example, in terms of PAR at the surface (or 1" below the surface) of the DT compared to PAR at the surface of the scrubber substrate?