Thanks Matt, to be honest not sure why these are doing better than my old Mitras...maybe the lenses? are they newer LED? no idea. The Hydra52 are much brighter than my old Mitras LED, these are as if not brighter than my Matrixx T5 light - Im running whites at 60% max (at 20% for evening viewing) and the tank is fully lit and not dim at all.
Im getting 350 PAR on sand and 600 PAR at the main rock work overhangs when run full on. Where most go wrong with LED is not using enough, with 4-5 units the tank is getting flooded with light and no shadowing that LED usually has against it.
Now the waiting game to see how all the corals react and grow, my lights are only 3months old so havent formed a solid opinion on them yet but a happy camper so far