I have found the answer to my lighting issue. I am going to upgrade the 4 existing 2-lamp T8 fixtures with 4-lamp models. I'm in the process of working out the install date, but I'm excited at the prospect of doubling the amount of fluorescent light in there.
Cooper Lighting WN432 specs:
Yearly Cost of 1000 lumens, 3000 hrs at .08 KWH = $2.86