My 12 x18 room can pop out 70 plants @ 4 oz per ...non hydro grow
10 - 600 will cover a 8 x 20 area (1 every 4x4 for best results) = 160 sq ft
6- 1000 will cover a 12 x 18 area (1 every 6x6 for best results) = 216 sq ft.... who has more sq ft and a better spread??
Just as long as your in the 2500 or more lumens per sq ft zone.... your garden will turn out fine from my experiences mine runs at 3000
yes I have a light meter.... 5500-5800 FC @12 inches
In your garden you are covering a 36 sq ft space with 1 x 1000w light
but you are suggesting a 600w will only cover a 16 sq ft space
you are allowing a 1000w light to cover over 2x the space of a 600w a 1000w light does not produce 2x the lumen of a 600w neither is it rated to cover 2x the space as a 600w but in your calculations this is what you are suggesting , you are under using a 600w light by your calculations
your personal arrangement and shape of your garden/environment maybe better suited to fewer 1000w lights i accept that
however if you allow a 600w to cover over 16 sq ft you will get a more balanced calculation
covering 20 sq ft with with each 600w light instead of 16 sqft
this is a more balanced amount of footprint, since you are covering 36 sq ft with a 1000w @ 3888 lumen per sqft
1 x 1000w = 140,000 lumens over (6x6) 36 sq ft = 3888 lumen per sqft (216) sqft @ 6000w
1 x 600w= 92,000 lumens over (5x4) 20 sq ft = 4600 lumen per sqft (200) sqft @ 6000w
so you can see that a 600w light can cover more space than you are giving it credit for
not only that it will actually produce more lumens in this space of 20 sq ft per 600
to reach the same lumen level of 3888 we could increase the 600w coverage to approaching 24 sqft at 3833 lumen
10x 600w @ 24 sqft per light is 240 sq ft @ 6000w @ 3833 lumen per sqft
peace