A Gram Per Watt? How?

[T.C. Bosby]

Alright, just so no one jumps on me, I'm NOT asking how to achieve that ratio (1g/watt). I've read enough to know that as a newb, if I can even get half a gram per Watt, I'm doing pretty good. My confusion is in how this is calculated with so many different grow styles.

For instance, let's say we have a 3' x 3' grow space under a 1000 W light.
Person A grows 1 plant per square foot, so 9 plants total.
Person B does a SOG with 4 plants per square foot, so 36 plants total.
Person C does a SCROG with 1 plant.

Understandably veg and flowering times differ between the 3 people. But assuming each person is a professional and has their setup dialed in, how will each one theoretically end up with 1000 g each?

Note: I did some more reading and am starting to think that the gram per watt is related to the size of the grow room it supports. A 1000 Watt light can support a larger grow space than a 600 Watt light, hence more bud. So is it correct to say that a gram per watt means you have the right grow light for the given grow space and using the best growth method for it?

 

[bryan oconner]

every watt no matter how many plants area so on . you should pull 1 gram per watt . I have never done this before . my highest was 1/2 per watt. who get 1 gpw ? mabe in a out side grow lol use the sun .

 

[RM3]

The reality is that it is an arbitrary notion that means nothing. Most don't add all devices, most don't consider actual wattage and as the OP asked it varies with different styles and strains.

I have a strain that will yield 8~9 oz's on a 3 foot plant in a 5 gal pot, if I stick 6 of em under my 1000 watts of light I can be a GPW champion

 

[phunt]

I think strain has a lot to do with it. A spindly sativa might not be even close and a big bud cross could do it a lot easier.

 

[Enigmatic Ways]

Alright, just so no one jumps on me, I'm NOT asking how to achieve that ratio (1g/watt). I've read enough to know that as a newb, if I can even get half a gram per Watt, I'm doing pretty good. My confusion is in how this is calculated with so many different grow styles.

For instance, let's say we have a 3' x 3' grow space under a 1000 W light.
Person A grows 1 plant per square foot, so 9 plants total.
Person B does a SOG with 4 plants per square foot, so 36 plants total.
Person C does a SCROG with 1 plant.

Understandably veg and flowering times differ between the 3 people. But assuming each person is a professional and has their setup dialed in, how will each one theoretically end up with 1000 g each?

Note: I did some more reading and am starting to think that the gram per watt is related to the size of the grow room it supports. A 1000 Watt light can support a larger grow space than a 600 Watt light, hence more bud. So is it correct to say that a gram per watt means you have the right grow light for the given grow space and using the best growth method for it?

Gpw is a slippery slope that's way most people don't like to use it there's just to many variables, seed/clone, veg time, medium just to name a few.

 

[Gregor Eisenhorn]

There are people who achieve the GPW, so it's not some mickey mouse bullshit.

But yeah, strain and experience are the most important factors.

 

[Feisty1UR]

This is making me question whether or not I'm doing it right.... I'm using a 400w in a 3x3 space. So you're saying I should use a 1000w? But then surely my temps would be waaaaayyyy tooo high for such a small area

 

[dandyrandy]

Density

 

[RM3]

Wouldn't want anyone to think I was lying
.

 

[Gary Goodson]

Wouldn't want anyone to think I was lying
.
View attachment 3643542 View attachment 3643543 View attachment 3643544

Oh I see you use the ole mtn dew as well lol

 

[Cyrus420]

Wouldn't want anyone to think I was lying

Damn son.

What strain is this? I'm looking for a heavy yielder to fill up my 2x2.

 

[RM3]

Damn son.

What strain is this? I'm looking for a heavy yielder to fill up my 2x2.

One of the first strains I bred, I call it STP short for Stop The Pain

 

[KryptoBud]

I think GPW is the equivalent of MPG in cars. We could drive the same cars and have very different driving habits making our mileage completely different.

 

[jafro daweedhound]

Note: I did some more reading

Best advice is to do some more reading... and just when you read all you think there is - read some more. Knowledge is the key to success.
I get over a gram per watt, im not bragging, I have been doing this for 30 plus years and have studied my ass off to be at the top of my game. You can do it too, just keep improving and build on your success.
Just a hint maybe, for each 6.5 feet by 6.5 feet I use a 600 watt MH (supper, coated, base up - old school) I pack them in at a rate of 12 in this space in 5 gallon grow bags ( buckets are too tall )
14 days veg, 63 days to flower, ( im using a sativa as an example ) plants are 5 feet tall and will give me 900 grams in that space. I am talking about properly dried and manicured buds. Other strains may give less or even more. I have been privileged to see grows that with 10 x 1000watts in 75 days produces 20 plus pounds.

Check this out on youtube ;
7 Gallon Pot's 7ft Tree's 20+ lbs John Berfelo

 

[jafro daweedhound]

Wouldn't want anyone to think I was lying
.
View attachment 3643542 View attachment 3643543 View attachment 3643544

Nice work,

 

[jafro daweedhound]

This is making me question whether or not I'm doing it right.... I'm using a 400w in a 3x3 space. So you're saying I should use a 1000w? But then surely my temps would be waaaaayyyy tooo high for such a small area

You are correct - 400 is good for your space
Your oven uses about a 1000 watts to bake food.

 

[Feisty1UR]

You are correct - 400 is good for your space
Your oven uses about a 1000 watts to bake food.

I can't expect a high yield? or hit the 1g per /w mark? OP is suggesting that you need 1000w for a 3x3 space. So I'm confused... Somebody was talking about using 100w per square foot. So in reality I need 900w for my 3x3 space to be able to hit the 1g per /w?

The strain im running atm suggests I should get 525 - 575 per m2? I've lsted/topped mine, check my journal and give a little advice.. I know enviromental factor is the most important thing for yield, everything is dialed in to the optimum 70-75 farenheit, humidity 40-50. Currently at week 3

 

[GrumpyToker]

General rule in regards to HPS flowering from my understanding is

2x4 or 8 sq ft = 400w
3x3 or 9 sq ft = 600w
4x4 or 12 sq ft = 1000w

 

[explosive82]

Its a number's game having more plants makes it easier to hit these sort of numbers. I use gavita de 1000w lights and i'm usually getting about 1.2g/w

 

[jafro daweedhound]

I can't expect a high yield? or hit the 1g per /w mark? OP is suggesting that you need 1000w for a 3x3 space.

I wouldn't put 1000 watts in 9 sq/ft ever. I have been doing this since the early 80's never heard or seen that to work in my opinion. You will always have to ask your self what is too much, what is too little. experience and studying what works for others will guide you.
Too much light can , make your buds bitter to smoke as turpennes are suppressed due to light stress,
Excess light levels can make your plants "bolt" similar to lettuce. A long spike like top will develop and never reach full potential,
Excess light will require the plants to uptake additional water to protect themselves. Plant Growth = Uptake/intake - evaporation.

For every 42 sq/ft I use 600 watts and expect to get up to 900 grams of dried bud with my heavier producers, I dont use Co2 currently either. Lighter producers 1 gram/ watt

This is my experience - others will have different results - I have been studying botany since the mid 80's and consider myself to be an experienced and qualified plantsman in this industry. Due to security reasons I cannot provided you with proof of my experience - the patients I work with know and that's good enough for me...