welcome !!!!! I was just down there visiting and went to an awesome store there called Reef Monsters over in Mesa. Check it out. i bought some cool corals.
I use 2 MP10wES for my 84g tank and its by far plenty. I used the Ecotech website and inputted demensions. it shows that it will be in an optimal range for most and be on upper power side if going for large SPS tank.