@DSC reef I have had the fixture 6 months, I was going to use it on a stand alone system. I decided to give it a shot and other than the little issue I had which turned into a GFCI issue - I am SO GLAD I DID. Its coverage on my 80 is I would say over coverage. I lent out my Par Meter but should have it back on Tuesday, and will post up my Pars for you on the 250w dual arc bulbs.
Also both of my clams are in tanks with ATI T5s on them and they do just fine. MY Squamy is getting about 200 par and thriving.