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If it's a true 600watt Led, at the wall, that should be plenty,, I would think, but there is others that can answer your questions, better than I can, good luck with your grow.
Is it a 600 watt "equivelant" or does it draw 600 watts from the wall? If it draws 600 watts from the wall then it will likely be plenty for a 4x4 space! If it is 600 watt "equivelant" it really depends on the particular light.
Odds are, either way, you will probably see an improvement over a 400 watt hid.
I would check with the manufacturer about coverage - or - read the instructions you got with it and it should tell you the coverage plus how far away should you hang your light.
Most '600W leds' use perhaps 200-300 watts from the wall. Because most of these fixtures use relatively inefficient diodes, you will need the same power density as your MH/HPS-50w/ sq ft. That means the 600w fixture will actually cover 4-6 sqft, that's a bit short of the 16 sq ft you're working with.
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