This observation of mine, is just an observation, but as an example, the LEDs in the pic report 30W, that is to say "surely" between both bars, that is (3w x 5 LEDs) each bar.
After observing several publications, I have only found that "Denali" is the one that offers the highest light output. They offer LEDs of 7 and 10W each LED ... that is, bars of 4 LEDs have 28/40W of power each one
Obviously, its price is also "powerful"