That's sun systems and I have one hanging on a rail right now..
As we know the DE lamp can't be directly cooled. the ac/de has a chamber above the lamp so the only real cooling is done without actually cooling the lamp.
I've found most of sun systems stuff solid and am a repeat customer several times.
As for the ac/de , it's a nice hood but make sure you can run it at least 24 inches off the canopy. It's a fairly slim hood but does require higher ceilings.