lighting question

[milkman407]

http://www.aquatraders.com/48-inch-2x54W-T5-Aquarium-Light-Fixture-p/52123p.htm

think thats worth buying for my 120gallon 4x2x2 dual overflow. using it for freshwater.
Or would I be better off finding a different light?

I want to be able to turn the light on and have it be bright.