GPW (Grams Per Watt) more like GP-WTF

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thetrogdor

Active Member
This is a very confusing idea to me... is that per plant? per square foot? per blah blah blah...

Can someone please clarify this for me.

I know it is not exact, but i have 12 plants under a 1000w that is on for 18 hours a day...

Im curious as to what i am going to get in GENERAL from this setup...

and again, i know it is a very unreliable method of prediction. i just wanna know.
 
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thetrogdor

Active Member
that doesnt make sense...

Not one bit. if you have 4, 5 foot plants under a 1000w light, that are not blocking eachothers light, as compared to 1 plant under that light, the yireld will be much more.

Again... makes no sense. that cant be correct.
 
svchop889

svchop889

Well-Known Member
thetrogdor said:
that doesnt make sense...

Not one bit. if you have 4, 5 foot plants under a 1000w light, that are not blocking eachothers light, as compared to 1 plant under that light, the yireld will be much more.

Again... makes no sense. that cant be correct.
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well it is correct, and if you only have one plant under a 1000w you better be vegging that thing for three months and training it into a screen.
 
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thetrogdor

Active Member
It cant be. the light that doesnt touch the one plant isnt going to redirect its self and be like a plant seeking missile and search for the plant. if they arent blocking eachothers light, that cant be correct. sorry

So my 12 plants are only going to put off 1000 grams at best... why do people not just grow 1 plant then. there has to be an advantage to having many.

If that logic is right, im only going to get about 2 pounds off 12 plants. thats freakin horrible.
 
svchop889

svchop889

Well-Known Member
you can yield the same from 1 plant as 6 if you do it right. like you said its a really unreliable method of prediction. That's why its used mostly as a measurement of how well you did post harvest than anything.
 
whiteflour

whiteflour

Well-Known Member
thetrogdor said:
So my 12 plants are only going to put off 1000 grams at best... why do people not just grow 1 plant then. there has to be an advantage to having many.
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The simple answer is time, and time is money, especially when you have a power bill due every 30 days.
 
whiteflour

whiteflour

Well-Known Member
Only cops weigh plants wet, and they weigh the plant and all. We'd be talking 10-20 pounds a light.... now that's efficiency.
 
Tagh

Tagh

Active Member
I think its meant kind of a reference, You try and get the most GPW, don't matter what your set up is but maximizing GPW by any means possible.
 
STZ

STZ

Active Member
Lol GPW (Grams Per Watt) is simply the amount of watts of light you're using compared to the number of grams of dry, manicured bud you get. It doesn't matter one bit whether you have 1 plant or fucking 1000 plants. So 1000w of light and 500g dry bud (regardless of how many plants) is 0.5gpw, or exactly one half of a gram per watt of light. Easy.

As far as why some people would grow only one plant and some would grow 12 under the same light, its a matter of preference and time. If you don't tending to multiple plants and having a shorter veg time, grow more. If you'd rather put more energy into one big plant and veg for longer, that works too :)

And if you're expecting to get two pounds from 12 plants under a 1000w light, I have two things to say to you - 1) Good luck. 2) Try not to be too disappointed with your "horrible" yield lol. You (or anyone for that matter) should be thoroughly satisfied with two pounds from one thowie.
 
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thetrogdor

Active Member
How tall should i go with 9 plants under a 1000w...i have about 5ft max i can get them too since the light has to be 24 inches away. im looking for a half lb a plant ideally.
 
FuZZyBUDz

FuZZyBUDz

Well-Known Member
by the sounds of the questions ur asking u either got ALOT of reading to do to accomplish ur goal or ur talking out the rear?
 
svchop889

svchop889

Well-Known Member
thetrogdor said:
How tall should i go with 9 plants under a 1000w...i have about 5ft max i can get them too since the light has to be 24 inches away. im looking for a half lb a plant ideally.
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Not going to happen your looking for 8oz off of a plant 5ft tall? it better be 5 feet around as well.
 
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thetrogdor

Active Member
I've seen it. My strains are heavy producers and I picked the seeds from my favorite plants on a huge medical farm in sonoma.
I will be running a 1000w hps + a 400w mh. My ph is perfect. My nute amount is perfect, and so is my temp and humidity. I am pretty well educated on the art of growing and not just weed :-). Just not indoors. I do not think 6-8 ounces a plant is too far off from being a possibility.

If I'm completely wrong let me know.
But I didn't start this without making sure I knew what it would require. :-/
 
dadio161

dadio161

Well-Known Member
thetrogdor said:
I've seen it. My strains are heavy producers and I picked the seeds from my favorite plants on a huge medical farm in sonoma.
I will be running a 1000w hps + a 400w mh. My ph is perfect. My nute amount is perfect, and so is my temp and humidity. I am pretty well educated on the art of growing and not just weed :-). Just not indoors. I do not think 6-8 ounces a plant is too far off from being a possibility.

If I'm completely wrong let me know.
But I didn't start this without making sure I knew what it would require. :-/
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This isn't going to happen. You will be lucky to get 3 oz. a plant if you have a lot of room. As the plants thrive and grow, they will block light to lower parts of the plant. You will get very little quality bud from the lower third of the plant.
 
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mike.o420

Member
thetrogdor said:
I've seen it. My strains are heavy producers and I picked the seeds from my favorite plants on a huge medical farm in sonoma.
I will be running a 1000w hps + a 400w mh. My ph is perfect. My nute amount is perfect, and so is my temp and humidity. I am pretty well educated on the art of growing and not just weed :-). Just not indoors. I do not think 6-8 ounces a plant is too far off from being a possibility.

If I'm completely wrong let me know.
But I didn't start this without making sure I knew what it would require. :-/
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your never gonna get 8 ozs off a plant indoors unless u have 10 foot tall trees, sorry dude( especially ur first grow, u should be happy with 1 or 2oz per plant), u should grow outside if u want a yield like that.
 
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