I keep my 1000w 12-16 inchs from the canopy not 2 feet or more....... Further more 600w is more efficient then a 400w this is old news man .... 600w is most lumens per wat..... My 600w is a little under 5amps and my 400w is a little under 4amps so they are almost same amps but the 600w gets 50,000 more lumens so id rather add an extra amp or two and gain more then double the lumens.... This is common sense here
your 400's suck then my only draw 1.8 amps each! you clearly calculate only for yourself and your equipment..try thinking outside the box homie.
12-16 inches is a big difference..wich is it 12" or 16" why the variable distance? sounds like bs to me. and a 1000 watt light from either 12" or 16" looses oh about 25% of its lumens by the time it reaches the plants..you dont know inverse square law and its very obvious.
also 1 1000 watt looses lumens dramaticly towards the edge of its coverage area..were 2 x 400's give you two = light sources that can be put an equal distance apart from each other and a complete even bed of light aross the table from end to end. save a but ton of power and easier to cool..600's by lumen gen #'s only, yes are the most efficient lumen per watt light on the market..but thats only taking in one factor..lumen per watt..what about power cost? bulb cost? cooling? canopy level? ballast cost ? etc..400 wins every time when you actually factor in true efficiency across the board.
i have 2 1000's, 3 600's, 4 400's , a 250 , a t5 high output 4 foot 6 bulb..125 watt hydrofarm cfl, two light house ufo led's @ 90w each(made in usa)
ive compaired each over and over, and from the results..a combination of 4 x 400's and the leds does wonderfull ..great spectrum and light pen.
in a 10x10..light from wall to wall..
my crystal production has been the same if not more since i added the leds for extra spectrum, and my power bill dropped about 50-60 bucks a month right off the top.
my temps became even easier to control and dropped overall about 2-3 degrees.
my yields and product were even match no matter what size bulbs and ballast i use..
and it all started many years ago with a compair grow of 1 1000w vs 2 400's..
i saved power there to, easier to cool, and got the same exact product wieght and potency except the 400's did better near the wall edges than one 1000watter did..
all the buds were nice and uniform across the canopy as well, were as the 1 1000 watt..the highest biggest buds were of course center, under the light and got smaller in size the further away it got..
two light sources closer to your plantz vs one from further away..
its really a simple concept to grasp..its actually a way to counter the inverse sqaure law that costs your thousand watter lumens from the center out.
i also am perpetual, so my control is always correct..same mom, same clones/strain grown, same veg time etc.
genetics have more to do with every living plant or person than the light .
for example..short , tall, big and small were all born under the same sun(light)
think about it.
its the genetics..like querkle from tga..once you get it to its breaking point your yields will be the same everytime given the same setup is used/methods/etc..
not many folks take the time to grow the same strain for 10 years straight either.