Welcome to OG @Longtooth , you should drop by the introduce yourself thread and say hello to the community.
As for the difference in yields, there are so many factors at play. I have seen people get higher yields and lower yields when switching to LED. Many times it’s just a matter of dialing in the grow to work optimally after the change in lighting. There is also quality to throw into the mix. I would gladly take a 15% drop in yield if it produced better bud. Personally I am an LED guy but have used MH/HPS. I say to just go with what works, no denying the tried and true MH/HPS setup works but I think we are to the point in LED that we can now say the same for it.