Thank you very much that’s quite helpful.I can't find any useful specs on that fixture other than wattage.
It uses epistar leds, so at best I'd say that it's capable of producing 2.0umoles/watt.
1200 umoles ppf distributed over the 1.5 sq meters in a 4x4 should give you an average ppfd of 800 across that area.
That should work quite well.
Thank youyes thats enough light for a 4 x 4 tent
Thanx600 watts in a 4'x4' is 37.5 watts per sq ft.. You could do it, that's about the bare minimum.