Agree with marius. And just based on personal experience i would even pic a old gen 1 radion over any of these units we see flooding our shores... the companies like ecotech, orphek and vertex put huge amounts of R&D into their units...to be sure you get the best for your corals...
Physical size the Radion Pro is not even half the size of the Zetlight.
The older Radion Gen 2 are the same physical size as the new Pro.
Going SPS, and in the same space as what you can get in one Zetlight unit, you can hang 2 Radion Pro. OK, price wise the Radion is more expensive, same as the BMW. But on the Gen 2, that would be 270 what, compared to 200W.
Most likely at least 4 Radions. Maybe even 6 in two lines.
You tank is wide. Double row of lights would work out better, depending on scaping options. And tank is shallow. Water would be 400mm about. Any 60 degree beam from LEDS would force you to have more units. Maybe 120 degree would work, as you do not need the punch of a narrow beam. Think even 90 degree would not be ideal in your setup.
Or whichever LED option you tank, you would get better coverage using 2 rows. Even Zetlight you would use 4 most likely. Maybe Zetlight would be better, as you do not need to light up corals on the sand that would be in other systems 600 or 700mm under water.