I bought one of the 165W fixtures like that over a year ago. My softy corals stayed alive but didn't grow at all. I put an electric meter on the two cables and got maybe 27W on one and 24W on the other.
I wrote a bad review to warn other buyers and I think Amazon pulled it. I had reported my findings to them and all my money was promptly refunded and I got to keep it. I got a long letter from the seller who tried explaing PAR to me and other b.s. I didn't read it, it was a long-winded nonsense excuse that didn't address the low wattage properly. I was impressed by Amazon's quick action.
Amazon sells those meters for $19 and its a good investment when you really don't know what you're buying.