Another how much light question?

I just purchased an 850g aquarium that is 3' 6" high, The fw.misc group
thinks that the "watts per gallon" rule doesn't count in an aquarium of that
size. I think my biggest concern is the height of the tank.

I plan on growing average Wisconsin Pond weeds (oops) plants. Milfoil (not
eurasion) Hornwort, Cabomba, Anacharis, Duckweed, possibly even a few water
lilies.

I plan on starting with about 440 watts of fluorescent lighting. High
Output T12 fixtures with Cool White bulbs (don't know the numbers).

Any idea's, comments, suggestions invited!
JOhn