Gpw average???

[insanehq]

Weird post but just wondering on people experience on the best gpw, eg what would yeild the best gpw among these circumstances
1plant 1000w,600w,400w,200w,100w,
Obviously there is limit to where light intensity comes into it, is it better to do 2 200w setups or 1 400w setup, cobs have efficiency and i believe plants will also have some kind of efficiency aswell, does your gpw suffer after 1000w or more, or is the best gpw ratio achieved at a lower wattage like 200w?

 

[Airwalker16]

100w hps is the most efficient of them. So 2- 400's and a 200 is not as efficient as the Thowie. But for 1 plant, I'd use a 600 or even better buy a cob light from www.northerngrowlights.com because they generate so much less heat and the 3500k CCT can be used throughout the entire run from seed/clone to harvest.

 

[CobKits]

gpw is a misnomer

a person could throw clones in and run them for 8 weeks under 1000W and get say X grams
a person could veg for 8 weeks under 500W@24 hrs and flower them for 8 more weeks under 1000W and get 1.5X grams

which was the better deal?

 

[insanehq]

Yeah i have cobs alread man ive seen the light haha, lets say 4x4 800w cob and a 400w cob grown exactly the same will they yeild same gpw? Or will lower or higher watts give better gpw? Same strain same everything?

 

[insanehq]

Sorry i know there is many factors, but lets say exact same conditions same strain same everything, which will benefit more

 

[CobKits]

no provided you have at least enough light to make non-larf, less light will always yield more in GPW (depending on light tech- with HIDs larger bulbs are more efficient. with cobs, the same nmber of cobs run at 400W is 10% more efficient off the bat than run at 800, and youre also in a a more efficient use of light because of this (which keeps coming up, 3rd time tonight):

 

[Airwalker16]

Yeah i have cobs alread man ive seen the light haha, lets say 4x4 800w cob and a 400w cob grown exactly the same will they yeild same gpw? Or will lower or higher watts give better gpw? Same strain same everything?

Depends on the PpFD. If you're @ 700-900 with the 400w's and well over 1200 using 800w's, it's not going to be beneficial to the plant to have that many photons because it can't use them all, so the 400 would give you more gpw. A lot in part just because it's lower wattage to divide your yield by.

 

[insanehq]

Ok sweet thanks for that so 2 400w gardens will out perform an 800w garden thanks for the info @CobKits and @Airwalker16, i have 16 3590 in a 4x4 at 1400ma, so if i wanted big gpw around 400w would be best

 

[CobKits]

800W of cobs in a 4x4 is too much... but 400W might be too little. assuming they are both at 1400mA/56% efficiency you would have something like
800w: 50W/SF, ~28 PAR W/SF, ~1260 PPFD
400w: 25W/SF, ~14 PAR W/SF, ~630 PPFD

alternatively, take the same 800W of cobs you were running at 1400 mA and dim them to 750-800 mA and your 400W garden is now like 700-750 PPFD

 

[CobKits]

yeah for best GPW 630 PPFD can do it - but you better have a real nicely maintained canopy as any lower buds would be garbage

 

[Airwalker16]

Ok sweet thanks for that so 2 400w gardens will out perform an 800w garden thanks for the info @CobKits and @Airwalker16, i have 16 3590 in a 4x4 at 1400ma, so if i wanted big gpw around 400w would be best

So you have 800 w of cxb's. Use all in the 4x4 & dim to 75%. Voilah.

 

[PerroVerde]

Or 16 cobs in a 4' x 4' with 2) HLG 320 1050's... 640 total watts = 21.96 par watts per square foot = PPFD of 1092 roughly or so my early morning calculations say... At a PPFP of 940 I need to dim for new plants in the beginning of flower to avoid toasting them and dim around week 6 to avoid excessive foxtailing....

 

[puffenuff]

There is no magic number that gives the best gpw.

 

[doz]

Here we are 13 posts deep and everyone is talking about PPFD and wattage.

Bigger than your light source is your plant genetics. Every plant is different and each pheno is different. Under a 600w CXB3590 setup in a 4x4 area, I grew 1.2GPW total (not including microbuds garbage pile, and fully trimmed not this half ass bullshit of weighing on the stick with fan leaves still intact like many do around here). In that setup, I had 6 plants. One strain is known to yield more and it sure did almost by 75% more. If I grew the same strain throughout, my yield would have potentially been 1.5gpw or even more.

GPW (really your total grow weight) can be used to measure the differences provided you utilize 2 grows comparing different light sources but thats about as far as it goes. It really is a poor measure of how well your garden did. One guy can grow with 1000PPFD with a low yield strain and another grow with 500PPFD with high yield strain and they come out even. So who did better?

Stupid....

 

[Evil-Mobo]

Here we are 13 posts deep and everyone is talking about PPFD and wattage.

Bigger than your light source is your plant genetics. Every plant is different and each pheno is different. Under a 600w CXB3590 setup in a 4x4 area, I grew 1.2GPW total (not including microbuds garbage pile, and fully trimmed not this half ass bullshit of weighing on the stick with fan leaves still intact like many do around here). In that setup, I had 6 plants. One strain is known to yield more and it sure did almost by 75% more. If I grew the same strain throughout, my yield would have potentially been 1.5gpw or even more.

GPW (really your total grow weight) can be used to measure the differences provided you utilize 2 grows comparing different light sources but thats about as far as it goes. It really is a poor measure of how well your garden did. One guy can grow with 1000PPFD with a low yield strain and another grow with 500PPFD with high yield strain and they come out even. So who did better?

Stupid....

Who ever did better is who ever incurred the least amount of cost to get to that yield IMHO. All flowers being equal of course. This is what no one does is calculate all other cost besides light when factoring grams per watt.

 

[researching]

There is no magic number that gives the best gpw.

This goes in line with my thinking of gpw. There are variables. The only determimation is consistency to develop a standard or reference point. Strain, scrogging, vs lst, vs lollipopping, topping, fimming, au naturale, veg time all will vary in gpw. So the determinator is a consistent dialed in grow that is repeatable, then a gpw can be determined for your setup. Then increasing that is the next step.

I believe lollipopping and canopy size via scrog or lst combined with topping/fimming is where you will get your best gpw. Colas upon colas.

 

[Shugglet]

Who ever did better is who ever incurred the least amount of cost to get to that yield IMHO. All flowers being equal of course. This is what no one does is calculate all other cost besides light when factoring grams per watt.

Also have to consider that it doesnt take a whole lot more weight on a plant to cover the additional costs of electricity (in most cases).

But yeah, I agree GPW should be calculated for the entire grow set up, not just the light.

I also agree with researching, as efficiently filling your grow space with flowers and budsites using some sort of training is the most efficient way of increasing GPW.

 

[pop22]

Seems there must be a better way to determine productivity, maybe gr/sq.ft? then it isn't just about the light, its about the garden as a whole. Even then, if you switch up strains often like i do, the numbers don't mean much unless you collect your data for each strain you grow more than once. Seems to me that consistency should be our primary goal, the improve upon that.

This goes in line with my thinking of gpw. There are variables. The only determimation is consistency to develop a standard or reference point. Strain, scrogging, vs lst, vs lollipopping, topping, fimming, au naturale, veg time all will vary in gpw. So the determinator is a consistent dialed in grow that is repeatable, then a gpw can be determined for your setup. Then increasing that is the next step.

I believe lollipopping and canopy size via scrog or lst combined with topping/fimming is where you will get your best gpw. Colas upon colas.

 

[Airwalker16]

Gpw is a commercial standard. They take in light costs and productivity as a whole.

 

[Shugglet]

Gpw is a commercial standard. They take in light costs and productivity as a whole.

The idea is that it would seem people only refer to the amount of watts that go into the light, not anything else. Which can be misleading.