I also ordered the PacSun unit (1 master - 2 slaves) for my 72" 125g.
There are many different LEDs in the market. You need the right combination and number to get coral growth. If you look at the
ReefCentral post you can see PAR number comparisons of
LED to other types of lighting.
The PacSun 120w unit I'm getting is supposed to equal 400w
MH lighting at full power.