1000w vs 600w vs 400w light intensity pondering..

Have been reading alot about the 1000w vs 600w vs 400w debate for a while. Found a chart that seems to answer the question..

If a 1000w Hps is hung 16 inch above canopy it gets a "light intensity" of 25 067 Footcandles. Since you can place a 600w Hps closer to canopy, lets say 10 inch above canopy, it gets a "light intensity" of 42 170 Footcandles. If we go to 400w, you can place it, maybe 6 inch from canopy, that gives a "light intensity" of 67 482 Footcandles.

All of the above "distance from canopy" can of course vary a bit depending on aircooled hoods, but a 400w/600w can be hung closer to canopy.

Lets asume a mature bud in late flowering gets 6 inch tall, the following "light intensity" will be

1000w
@16 inch 25 067 Footcandles
@22 inch 13 259 Footcandles

600w
@10 Inch 42 170 Footcandles
@16 Inch 16 473 Footcandles

400w
@6 Inch 63 662 Footcandles
@12 Inch 15 915 Footcandles

To me it seems that it is much better to use 3x600 watt than 2x1000, or 5x400 instead of 2x1000..

Here is the link to the above "light intensity chart"
http://www.thctalk.com/cannabis-forum/showthread.php?362-Light-Distance-Chart-s

Feel free to differ..