What Is the Average? (Grams Per Watt)

i have never paid a great deal of attention to gram per watt scores i do not think they are usefull for most growers, unless the cost of electricity is the most importent thing to you

in my view i would compare how much yield could be produced in a given space, most seed companys quote in m2, that again i do not fully understand as plants are not 2 dimentional , yield should be quoted in cubic area (indoors) as there will normly be height restrictions indoor

i guess if weed was grown outdoor it would also be quoted in area but since there is no real height restrictions outdoor then m2 would work for me

the number one way to increase yield in a given space is to increase the light which the plants recive this would inturn, produce a poor gram for watt score but would produce more yield in the same space

600 watt sodiums are said to cover 1.5 m2

if 1.5 m2 was the only space you had you could maximise the yield in that space by adding more light than 600w you would spend more electricity to do this and have a lower gramm for watt score , but would produce more bud in the same space .. i could take one of my lights away and get a huge gram for what score, or leave it there and get more bud

skunkd0c said:

the number one way to increase yield in a given space is to increase the light which the plants recive this would inturn, produce a poor gram for watt score but would produce more yield in the same space

Click to expand...

Not so, but a typical misconception. Learn the concept of "light saturation". You CAN give a plant too much light which WILL decrease yields.

Grams/per watt is meaningless in the real world and another one of those forum paradigms started about 14 years ago that just won't die, much like the "you can't give a plant too much light" mantra, often parroted by chest beating noobs that have little gardening experience. One should be using PAR watts received as it pertains to yields of certain plant material. Such factors as type of hoods, lumen output, hood efficiency, plant material being measured (no stems no seeds dat wee don knead), confirmation/credibility of anecdotal posts, etc.

UB

perhaps you should re-read what i wrote, my experience confirms my statement,

I did not suggest plants couldn't be given too much light, from my experience increasing the light UPTO A POINT,
will increse yield, like i said, if i was to go by the 600w= 1.5 meter rule, i would be using only 2 lights, insted i am using 3 lights which will give me more yield but as a result my lumen per watt score would be lower .. i hope that is clear now

I really didn't feel it was necessary to add the (upto a point) in my first post as i thought that would of been obvious, my error for making the asumption that someone wouldn't come along and dot my i's for me lol and THANKYOU kind sir

skunkd0c said:

perhaps you should re-read what i wrote, my experience confirms my statement,

I did not suggest plants couldn't be given too much light, from my experience increasing the light UPTO A POINT,
will increse yield, like i said, if i was to go by the 600w= 1.5 meter rule, i would be using only 2 lights, insted i am using 3 lights which will give me more yield but as a result my lumen per watt score would be lower .. i hope that is clear now

I really didn't feel it was necessary to add the (upto a point) in my first post as i thought that would of been obvious, my error for making the asumption that someone wouldn't come along and dot my i's for me lol and THANKYOU kind sir

Click to expand...

Well, I assumed, perhaps wrongly, that you were in the camp of "more is better" when it comes to light. I see it all too often. There are so many factors at play here. For instance, taking the same 600W HPS and putting it into 4 different hoods, you're gonna get 4 different yields with a parabolic type hood being the least effective and a small horizontal hood with a gullwing specular insert most likely coming up tops regarding efficiency and effectiveness.

Light is a small part of the total equation when it comes to growing a healthy plant and its yields. Most important part is what the plants are receiving and ironically I doubt if anyone around these parts even owns a light meter, and if they do, it's probably one of those cheesy ones that register only to 5K f.c. Most HID lamps emit more output than the sun, depending on where you measure, a fact that few understand. A high quality meter that registers to 10K is really a nice tool to have around. What's ironical is folks will piss off $113/liter on useless snake oil crap like Canna Boost but won't bother to spend a $100 on a light meter that will do them some good.

It's like the ol % THC folks loosely talk about. It's all a fluff as there is not agreement as to where the tissue was taken from, when, who was doing the "testing" and whether or not they are non-biased or going for a Cup award to increase sales, even it if means buying off judges.

UB

1g/watt is only likely unfortunately with hps.
i use cfl and led lighting, so i get much better quality bud from the led than an mh or hps.
but hps gives perfect flowering light spectrum
led gives perfect vegi spectrum

sgt.stiffy said:

1g/watt is only likely unfortunately with hps.
i use cfl and led lighting, so i get much better quality bud from the led than an mh or hps.
but hps gives perfect flowering light spectrum
led gives perfect vegi spectrum

Click to expand...

mmmmmmmm

you have some research to do young one.. I can tell by your muddled mixtures of magical LED ideas.

mh/hps are in no way inferior to LED in terms of quality
led spectrum is totally customizable... thats like saying HID is perfect for one or the other or CFL is good for one or the other... all depends on the bulbs.

skunkd0c said:

i have never paid a great deal of attention to gram per watt scores i do not think they are usefull for most growers, unless the cost of electricity is the most importent thing to you

in my view i would compare how much yield could be produced in a given space, most seed companys quote in m2, that again i do not fully understand as plants are not 2 dimentional , yield should be quoted in cubic area (indoors) as there will normly be height restrictions indoor

i guess if weed was grown outdoor it would also be quoted in area but since there is no real height restrictions outdoor then m2 would work for me

the number one way to increase yield in a given space is to increase the light which the plants recive this would inturn, produce a poor gram for watt score but would produce more yield in the same space

600 watt sodiums are said to cover 1.5 m2

if 1.5 m2 was the only space you had you could maximise the yield in that space by adding more light than 600w you would spend more electricity to do this and have a lower gramm for watt score , but would produce more bud in the same space .. i could take one of my lights away and get a huge gram for what score, or leave it there and get more bud

Click to expand...

my 600hps is covering .23 square meters

Man the debate on this post is awesome! Its unfortunate that the stereotype of a person who smokes-out is a dumbass, at least it is here in the bible belt. When I'm on here researching I'm totally blown away by how intelligent many of the members are. Not only by the level of knowledge about MJ, but the creativeness of the DIY grow rooms, plant biology etc..

It sucks that our pursuit of happiness is hampered by the narrow minded who refuse to educate themselves on the subject. Its been an uphill battle, just got to get the other 37 states to wake up. Yeah I know its off topic but the thought won't leave my mind.

i get around 500 gr. per sq. meter every 54 days.

i think the grams per sq. meter. is the best method of measuring success.... just imo.

sgt.stiffy said:

1g/watt is only likely unfortunately with hps.
i use cfl and led lighting, so i get much better quality bud from the led than an mh or hps.
but hps gives perfect flowering light spectrum
led gives perfect vegi spectrum

Click to expand...

you think LED lights give better bud than a HPS?? u must be smokin

depends on the strain size of plants how much lights is going to waste how much vegitation. i used to grow 4 plants under 400watt hps and got 1.5 oz per plant plants were growing in 10 litre pots but now i have started super cropping have bigger bushy plants with more colas using more of the light not a spot hitting the floor, just a blanket of buds and switched to 30 litre pots and now get up to 5 times more buds 820grams average all in, all to often i hear on this site of people going power mad more power more buds when in actual fact most of there people are wasting alot of that light and wasting money on energy bills

Uncle Ben said:

Not so, but a typical misconception. Learn the concept of "light saturation". You CAN give a plant too much light which WILL decrease yields.

Grams/per watt is meaningless in the real world and another one of those forum paradigms started about 14 years ago that just won't die, much like the "you can't give a plant too much light" mantra, often parroted by chest beating noobs that have little gardening experience. One should be using PAR watts received as it pertains to yields of certain plant material. Such factors as type of hoods, lumen output, hood efficiency, plant material being measured (no stems no seeds dat wee don knead), confirmation/credibility of anecdotal posts, etc.

UB

Click to expand...

not to arguee, but i have to disagree.... show me one case/picture of a plant receiving too much light... electric lights just cant compare to the sun... if all the other conditions/nutrients are optimal, then the plant should be able to receive, process, and photosynthesize any a mount of artificial light that you give it... imo/experience.

can you tell me how much light is too much?

i have 1000 waters spaced like 6-8 inches apart and its never too much. if i take a light out... the yield goes down. but i could agree that at some point you are just wasting your money but i dont understand how it could actually DECREASE yield? anyhow, i dont want to be a jerk here, so maybe you could tell me at what point would you say the extra light starts decreasing yield and how does that happen?

i have heard that if you can control the enviroment well enough, that vertical hanging lights with no reflectors can produce you 10%-20% more weed . By getting more light to the lower budding sites. Try to surround the light with plants and turn them 1/4 turn each day.

on my first grow with a 600 w hps i hit 0.7 gpw, i had 10 plants in a 3 x 6 ft space, i vegged for 5 weeks.

this grow ive got 2x 600w hps in the same room 3x 6 ft with only 4 plants vegged for 8-9weeks,my lights are in cooltubes and i have a scrog setup around the lights givin me 40+ sq ft.

both grows been in soil ill update on the results in 8 weeks....

jberry said:

not to arguee, but i have to disagree.... show me one case/picture of a plant receiving too much light... electric lights just cant compare to the sun... if all the other conditions/nutrients are optimal, then the plant should be able to receive, process, and photosynthesize any a mount of artificial light that you give it... imo/experience.

can you tell me how much light is too much?

i have 1000 waters spaced like 6-8 inches apart and its never too much. if i take a light out... the yield goes down. but i could agree that at some point you are just wasting your money but i dont understand how it could actually DECREASE yield? anyhow, i dont want to be a jerk here, so maybe you could tell me at what point would you say the extra light starts decreasing yield and how does that happen?

Click to expand...

yes u can have to mutch light i had my 2x 600 about 10-12" away in cool tubes and it caused my leaves to turn lime-yellow.
i looked it up its called lightbleaching,
whot i found out was the light actually kills the clorophyl wich gives it the green colour and that what makes the plant grow so yes u would lose yield. ive now pulled my lights back just 2-4 " and in few days are perfectly green again....

In my first grow with a 1000W and six plants no pruning, vegged 30 days, good newts, clean water, pretty bad temperature fluctuations, and a week and a half of a spider mite problem and some powder mildew. I had six differents plants that averaged 2oz per plant with some more and some less most being three (North Bay Scarlet Fire) and the lowest being one (bubba kush). All of them grew in a 3x7 closet
I learned a lot in the grwo and was happy with 12oz off six plants at .4g/watt

I have altered my temperature controls, and topped and lollipopped each of the ladies and the buds are looking excellent will def produce more, better bud

hello,
I wanted to clairify, it's grams per watt per month.

It is the official benchmark of the pro grows. We have been using that term since around 1996 (I think Cervantez started it).

In 2000 a guy from Vancouver BC used the daily hand fed flow to waste technique using 50/50 Coco/Hydroton and got 1 gram per watt per month journaled in High Times. I immediately started using that technique and found it to be the very best system (substituting coarse perlite for hydroton).

I was given the opportunity to be the first man in America to use the new 160 watt Light Emitting Plasma system from Luxim as a grow light and I achieved 1.2 grams per watt per month (330 grams plus 1/2 oz. kief in 1.75 months)

As far as I know thats a world record.

The key is efficiency. Listen to the plants scientificly. Get a Brix meter to test the sugars and a handheld microscope to watch the stomata gobble up the CO2. That's when you know they like what you're doing to them. Work out all the variables monitoring thier response in real time. That's how you go like a pro. This is Olympic shit here.

Oh yeah, @ jberry, you put 1000 watt lights 6-8 inches apart? Do you meen from the side of the reflector or to the light center? Unless they are water cooled this is very unorthodox. The amount of air circulation you would need would be destructive and not to mention controlling your relative humidity. You would have to place the plants about 4 feet under the lights which is counter productive. space them further get them closer and use the the photon yield increase for a better harvest.

There are tons of variables to factor in on this one. i could ramble on forever on them but we all know that the average is 1 gram per watt. but untill you make it there or beyond expect .5 g per watt.

jokero11 said:

yes u can have to mutch light i had my 2x 600 about 10-12" away in cool tubes and it caused my leaves to turn lime-yellow.
i looked it up its called lightbleaching,
whot i found out was the light actually kills the clorophyl wich gives it the green colour and that what makes the plant grow so yes u would lose yield. ive now pulled my lights back just 2-4 " and in few days are perfectly green again....

Click to expand...

yea, hot spots.... i could see how getting the bulb too close could cause hot spots and bleaching problems... ten inches is pretty close, even for a 600W.

but im saying 3000 watts over a 4x8 tray produces more than 2000 watts over a 4x8 tray.... simple.