Maximum yield from under 400w MH?

My plans thus far are as such,
use hydroton in 9' sq pots totaling 16 in 1m/sq,
fergitate with a top feed system,
the 1m/sq garden will be lit with a 400w MH,
begin flowering at about 6" so as they finish at about 18-24",
I also plan to use "the church" in this scheme
Obviously i will be using clones from a mother in a separate set up, under cfls or a 250w lamp

My question is simply what is the maximum yield from under a 400w so I know when to upgrade to a 600 or 100w lamp.

Thanks guys +rep

upgrade now. bigger light bigger yeild. You sound about dead on with the 400w. I Don't get more then about a oz per plant under the 400w

go the bigger light u will notice a huge differenct in yield. if its a bigger yield your after veg the plants abit longer if height isnt an issue

stumps said:

upgrade now. bigger light bigger yeild. You sound about dead on with the 400w. I Don't get more then about a oz per plant under the 400w

Click to expand...

How long do you veg for and how many lumens per sqf that you are getting an oz per plant?

The best you're ever really going to do is 1 gram per watt per two months. So a 400watt will yield around 14 oz if everything is done perfectly. Plant size, structure, and genetics play a HUGE role in yield as well. It really takes a lot of trial and error with your process to hit the 1 gram/watt benchmark. Beginners are lucky to hit half that.

To be honest my goal is 28g per plant. I already am in possession of 2x400w MH lamps, and am running test subjects now. I plan to veg clones for no more than 2-3 weeks(after rooting) so as a 9" pot will not be too small and so that their stature stays short. I plan to use 'The church", by GHS, which claims to produce 700-800g per m2. My issue with the larger lamp is that I plan to do all of this in a cabinet I plan to build, leading to larger fans and more airflow issues. I do not believe I fall into the beginners class, I've had a few successful projects in the past, and a few failed ones before those. I know bigger is better in America but I'm looking more into perfecting the standing design before I go out and spend more loot on larger wattage lamps.

I start flower at 24" give or take. I have 4 just about done and will be lucky to see a oz from all 4. This grow was just a abad deal from the start. Had my first real problem with spider mites.

Anyone else??

i run 400w cabs.
i just built two of them.
in the past ive had some pretty high yields, best was 240g off of 16 plants SOG, running NL#5.
i have since learned a few things.
now im trying out aurora b by the flying dutchmen. im hoping for 400g per 16 plants.
still establishing moms though, so no hard data on yields.
i have high hopes for the aurora b, from what little info i can find on it by people that have grown it, it seems to be the ideal strain for SOG

dont listen to the haters.... 400w is damn near overkill for a cab.... not so much for a room, then you want at least 600w per sq meter.
but in cabs theres different rules. heat is the biggest issue...
my current setup is a 3 tier system.... clones go under a 250w mh untill a certain height is reached, then they go into a slightly larger cab under a 400w mh untill they really start strecthing, then they finish under a 400 cmh in a seperate cab with some 43w cfl's for supplemental lighting.

this is the cab, give you an idea of the concept. still smells new, lol..

Thank you very much IAm5toned, I figure with the walls so close to provide reflective light and the total lumens produced a 18-24" plant is perfect for a 400w mh and it's light penetration pattern. Exhaust is critical in cabinet grows so as the temps and the RH stay down and the CO2 exchange is kept fast enough to allow proper growth.

bingo. i see you understand

over 170 views to these ten posts... Damn that's worse than a 15/1 ratio... Any Other Useful opinions out there??

Seriously...? I know that there are some knowledgeable people on this site somewhere... Come on....

I'm sorry to all of you that try and help others on this site but all I'm finding is negative vibes and stand offish pricks. Thanks for the help guys.

I swear if this thread hits 300 views and still has 12 votes I'ma tweak...

How sad is it to have a thread in which you post +50% of the replies...?

im with you m8 this site is fucking AWFULL for reply i dont know why they call it a forum????

Dude, give it a friggin' rest, will ya? You got your answer in this thread on the first page. But guess what, no one knows exactly what you'll yield. There are a hundred different variables. How about you answer your own question by flowering and update us in 2 months.

stumps said:

I start flower at 24" give or take. I have 4 just about done and will be lucky to see a oz from all 4. This grow was just a abad deal from the start. Had my first real problem with spider mites.

Click to expand...

Sounds about right provided there's enough light penetrating the canopy and making it to the bottom.... I can only assume you're using a 1000w hps....anything less seems like it just won't cut it..

LOL You gotta understand that most views are just from people learning and are not interested nor qualified to answer your question.

My first grow (oh, the memories) I vegged and flowered 1 plant from bagseed with a 400W MH. With no LST or scrog etc., I harvested 42 grams of fluffy airy bud. Not bad, but since then have upgraded to a 400W HPS conversion and the quality and quantity increased exponentially on my recent harvests. Rock hard buds and a 50% increase on average in weight. Mind you different strains and techniques were employed, but a great overall increase nonetheless.