One Radion will not cover 30" and grow sps at the same time. You'll need 2, so you are looking at $1500... why?
Go to Reef Breeders and look at the Photon32. You only need one, you can get whatever color leds you want, it puts out more PAR than a Radion (I own a PAR meter), you don't have to hook up a computer to change the controller settings, it's dead quiet, puts out less heat... oh, and at full retail it costs $450 vs $1500 for the Radions. I've had both and I sold my Radion after I got my EverGrow IT2080 (Reef Breeders32). I readily admit Eco Tech makes really great products, but they also really greatly overcharge for them! And in April EverGrow (and maybe Reef Breeders) will offer the light for $275 plus shipping (roughly $35 via air from China) when purchased in a group buy of 12 fixtures or more (mixture of models is OK).