If you are intending to keep less than 40% SPS in yr tank, it is enough provided you place yr SPS at the top and directly under the LED.
The thing about LED, it does not have reflector to "spread" the light rays and because it is direct light, there will be shadows and those corals at the corners will not get that much par, unless you customise your LED fixture to cover every inch of yr tank.
But if you are starting out with soft and LPS corals, 160 / 180 W is good enough for yr 2.5ft depth.