As above, the CREE LEDs run at between 3W and 5W each. You certainly can't look at one of those at full power.
For your size tank, something in the region of 80 to 120W would be good.
Have a look on eBay for panels like these. EVERGROW IT2060 LED LIGHT UNIT 24" FOR 2FT TO 3FT MARINE TROPICAL FISH TANK | eBay
It'll output light intensity in a different league to the one you have. There are similar, more "unbranded" makes of panels that look the same, but even cheaper, if you want to give one of those a whirl, but the Evergrow brand is fairly well respected. That unit has 51x 3W LEDs, so each LED is 38x more powerful than those you have and overall the unit is about 6x the power.
Sorry to put a downer on your light, but it's really just tiny numbers, not suitable. It might illuminate things, but compared to a proper LED panel, it's vastly underpowered. Unfortunately people see the acronym "LED" and think that's the end of it, then trust the Fluval brand.
On the bright side
Fish and corals will look miles better immediately, and over time they'll get much more colourful too, given proper phosphate control.