The current light you have will be enough. The coralline algae doesn't need massive lighting to grow...but corals will.
However you might want to still upgrade to a power compact light. I find that the 'came with the tank' light fixutre is usually not enough to fully light the tank, leaving your fish looking dull and drab.
A single 96watt power compact that's a 50/50 bulb would be plenty of light for the tank, and would even allow you to grow some soft corals, mainly shrooms