VaughnH, this will help you to play with PAR-meter more rationally

Reflectors and Double Fixtures with UVB Fluorescent Tubes,
and Make Yourself a UVB Spread Chart.

As we know for light intensities, we need not PAR itself, but daily PPF (i hope you have read my posts before on this with some great links).

For those missed it at APC, this is nicely corresponds to this 24 Wpg per day rule by Edward.

naman