Not to insult your intelligence Mr bill but I have never seen a 250 halide put down over 1200 par. I agree that some pigments mostly chlorophyll A use 630-660 nm range being said they receive only a small ammont of it 5 percent is doing me just fine
We do our PAR Measurements at 24". This is a more user friendly and less confusing as for SPS we want to see 200-500 PAR and most of our tanke are 18-30" Deep. A 400 watt Radium MH using a Reeflux Reflector puts out about 450 PAR @ 24". Some 250 watt MH loke the 10K XM come close to this. Just Remember that the intensity is the square of the distance.
The Radion Pro Spec of 1100 PAR does not specify a distance???
Its hard to say what distance they measured their PAR at, but given their components I would not be surprised if it was 12" Optics are the wild card and their chart does show a concentration or spotlighting in the middle.
A LED fixture we recently tested gave us over 500 PAR at 24" and over 2100 at 12"



