I literally would not worry about umol/2^s too much which is what I already mentioned.
All LED's these days are powerful enough to grow plants well, something that hasn't always been the case with artificial lighting in the past and exact calculations were needed.
you can place the light as close or as far away as you want
The only thing you need to be aware of when buying LED's is that some sellers will try to mislead you and tell you the amount of watts fitted to the unit - not the watts the unit pulls from the wall - which is usually half that.
I can tell you the 300 watt unit on the last post draws 150 watts. Still good value. Won't have the same CRI value as the lights you were looking at but half the price per watt and decent lights - only reason I wouldn't get those units is because they have noisy fans to cool them
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