lighting a 4' front to back tank (500 gallon)

[46bfinGA]

I am thinking about buying 2- 8 lamp tek lights for my 500. The tank is 4' front to back so I would center up the lights on the tank and lift them a bit to spread out the light. Dimensions on my tank are 8'x4'x2'.

Will this work ok? The tank is going to be full of softies and I really dont want more wattage then this. I actually have 2-8' 6 lamp fixtures that I was going to put side by side. but I like the looks of the Tek lights better then what I have. Are there any T5 lights out there that are around 36" wide that would spread out the light a little better?

Any thoughts?