Spring for 4 foot T5's, you can place them in the corners.
The bulbs I am using are 54 watts each.
Thats 216 watts.
Do 6 vertical four foot single bulb T5 lights at 54 watts each it adds up!
324 watts and since it's delivered from the sides it will be bright as He'll in there!
If you want to spend $150 a light you could put 3 total $450, you mount the four bulb fixtures vertical .
They come with bulbs installed and they daisy chain.
You The lower ambient heat and lower energy use.
A picture of my description on a smaller scale. You could also add an overhead Mogul based CFL.