You can but I would assume you'll have a slightly 'shaded area' on either side of you tank.You could keep some lower light plants towards the sides of your tanks and higher light toward the middle. Of course you will only have 6" or so of less light on each sideso it wouldn't be a drastic dropoff in light.
With that much light you will need to run co2.
Also are the bulbs actinic or a fw plant bulb(neighborhood of 5000-10000k)?