There are people on this very forum that have current LEDs and can't grow sps
under them. Anyone that knows anything about LEDs knows you can't grow sps
under .5 watt diodes. Even 1 watters are a stretch. That's why the first LED
companies went out of business. It's not because they didn't have the right ideas, it's because they used 1 watt emitters and couldn't sustain high light corals.
The study you seek is in my tank, and in many tanks many years ago, when people used extremely high par 6500k MH
Iwaki lamps to punch through deep water. I won't speak for them though...let's just use my experience- First, an anemone that went into a hole and started bleaching out from lack of light was doomed, until I focused a 5000k led
lamp from home depot (you must know the narrow spectrum associated with leds, which is why we use multiple colors) and it made a full recovery. Then it's the seemingly dormant monti caps in a shadowed area that I focused the same narrow spectrum 5000k lamp on, which now, are growing just as fast as the other caps in reach of the overhead lighting. This is certainly proof that high par, but not the usual spectrum (I won't say inaccurate, because that's opinion, and not fact, the fact is the right amount of par/pur for the right amount of time, and you'll grow corals regardless of spectrum) Is what's needed here.
A 5' tank you mention, but you still don't know what tank the OP is talking about and what lighting. BTW, there's no led
lighting sold by aquarium lighting manufacturers to date that will allow you to grow sps
on the sand bed of a 5' deep tank...probably not even lps
You, and many, many others have been an active part of this hobby for many years...That doesn't mean that you can't be wrong nor does it mean that you can't learn something new.