Yields at differant PPFD?

[Greengenes707]

Anyone can disagree with me and my results...and gavitas results...and the botany communities results...if you have evidence showing otherwise. If not, that is just opinion. Mine and the scientific communities results are not opinions, they are real results, that are backing text theory.

If someone wants my excel file then I'll email it. RIU won't let me upload it.

800umols is good. 1000umols is better.
I have ran both low and high densities and compared them to my own ability...apple to apples.
So ask to others chiming in. What were you results with the other side of the field...
If you like 500...what happened at 800+?
If you like 800+...what happened at lower?

If you read the quotes from tags420 and gavita it clearly says "linear increase up to 1000umols."
The study I snap shot showed about a 10% increase from 675umols to 1000umols.
My results have been closer to 15-20% from 700 to 1000.

 

[ttystikk]

Not sure if this has been posted yet;



This certainly seems to square with your own results, @Greengenes707

 

[Trippyness]

Anyone who doesn't tweak their grow from cycle to cycle isn't worth listening to. That is why you will never find the data you are looking for.

Unless you have some bizarre freak of a strain, 800umols ppfd is going to grow more bud than 600.

more photons = more plant matter

Think about it this way.......blue dream is a great plant to grow in the sun under 2000umols ppfd.
Do you think it is going to grow more bud if you throw a shade cloth over your greenhouse?

I am well aware, but by how much is the increase and is it worth the extra electric.

 

[Rahz]

Anyone can disagree with me and my results...and gavitas results...and the botany communities results...if you have evidence showing otherwise. If not, that is just opinion.

I'm not trying to be disagreeable but the yield/power ratios in the Potter and Duncombe pic does not seem linear.

 

[Trippyness]

Anyone can disagree with me and my results...and gavitas results...and the botany communities results...if you have evidence showing otherwise. If not, that is just opinion. Mine and the scientific communities results are not opinions, they are real results, that are backing text theory.

If someone wants my excel file then I'll email it. RIU won't let me upload it.

800umols is good. 1000umols is better.
I have ran both low and high densities and compared them to my own ability...apple to apples.
So ask to others chiming in. What were you results with the other side of the field...
If you like 500...what happened at 800+?
If you like 800+...what happened at lower?

If you read the quotes from tags420 and gavita it clearly says "linear increase up to 1000umols."
The study I snap shot showed about a 10% increase from 675umols to 1000umols.
My results have been closer to 15-20% from 700 to 1000.

Thats the data I was looking for. % increase.

 

[Greengenes707]

I'm not trying to be disagreeable but the yield/power ratios in the Potter and Duncombe pic does not seem linear.

Your so right...It's not "near linear" at all. We must be absolutely insane to make such a statement. And also must be the only data set to look at. And I'm sure they had no hypothesis that they were trying to show that probably said slightly different than their exact findings.
So you think it should determine in exact figures for all statements and expirements made about plants and photosynthesis?

Cause it's pretty damn near linear from data point to data point for a real world study.

 

[Rahz]

I didn't suggest anyone's viewpoint was insane, and in fact I've already stated my results are fairly linear... more so than the Potter Duncombe chart which is showing only 29% yield increase for over 100% more power unless I'm reading it wrong. That could be meaningful to someone and invokes the idea that 600 PPFD in a 4x4 would be better than 1200 PPFD in a 2x4.

 

[Trippyness]

I'm sure I can and will do better down the road. I was pheno hunting not looking to yield. I think when I'm running full speed I'm still not going to touch 3.5 a sq/f...

I run a heavy yielding Blue Dream in a 3 x 3 in 3 gal coco. Veg 4 weeks in a scrog to just over 24".
Hit just over 2lbs with 9 plants. Personally I find that light matters, but plant numbers and veg time matter alot more.
I personally will either be running Vero 29 or ACDE DE soon in a much larger space.

 

[Yodaweed]

I run a heavy yielding Blue Dream in a 3 x 3 in 3 gal coco. Veg 4 weeks in a scrog to just over 24".
Hit just over 2lbs with 9 plants. Personally I find that light matters, but plant numbers and veg time matter alot more.
I personally will either be running Vero 29 or ACDE DE soon in a much larger space.

2 pounds in a 3x3 (that's like 900grams per meter^2) with 4 weeks veg ??!?!? I'd like to see some picture of that...

 

[Greengenes707]

A great study by Bugbee
http://biology.mcgill.ca/Phytotron/LightWkshp1994/1.5 Bugbee/Bugbee text.htm
Conclusion
...Photosynthetic photon flux levels of 800 μmol m-2 s-1 are adequate to simulate field daily-integrated PPF levels for both short and long day plants, but plant canopies can benefit from much higher PPF levels.

 

[Will Thayer]

[QUOTE="churchhaze, post: 12540712, member: 171854"

I am not "180 weight", "I weigh 180".

It's poor use of the English language.[/QUOTE]

In the U.K. I weigh 18 stone.

I was taught imperial and metric in American school system as a child. I like metric because it is 10s and decimals. Fractions make my brain hurt. People still use both in U.K. but labeling laws for E.U. insist on metric.

Cheers,
Will

 

[Atulip]

I want to chime in and suggest the g/m2/day measurement over g/m2. It goes well with g/kwh, and with veg styles different, it's more accurate of a comparison. I run auto flowers in a single tent perpetual SoG and pull 800g+/m2 and nearly 2g/w. But that's 10-12 week seed to weed cycles, and 24/0 lights.

For light, I'd rather have a well spread ppf of 700-800, and add space. With limited space, bombard the suckers with light. Electrical costs are minimal compared to increased yields.

2.5'x5' tent with 23 autos currently

 

[ttystikk]

I am well aware, but by how much is the increase and is it worth the extra electric.

That's a question answered more by the constraints and desired outcomes of your individual situation.

 

[BuddyColas]

Hello all.

Here is a question that has plagued me for a while.

Just as an example Ill use a 5 x 5 grow space.

Lighting would be COBS.

What would the difference from say 600,700 and 800 PPFD in yield.

I have seen some people get 1.5-2gpw if you still count like that with 600PPFD.
Obviously experienced growers which is what I am talking here. No newbie runs.

Would like to see if there is a major difference in yield in the same environment, sample plant count, same clones etc.

Just seems that the jump from 600 to 800 may not make as much of a difference that I have though and may be able to lower Electric, but again I may be wrong.

Just would love to see some real world results as opposed to numbers.
Preferred COB grows.

Seems like this may be interesting to get going.
Plus, how much ppfd is needed until we are disinishing returns and the rest comes down to grow and plant numbers? Sure 800PPFD is what we aim for , but who is to day 600 is not where we need to be at with good grower experience.

Trippy

My main question was that if yield is not effected say on a 600PPFD or 800PPFD than what is the point of the extra light?
Im not a cheap person, but conservative. Real world results mean more to me than hypothetical numbers.
Mainly planning a Vero29 build or CXB build and wondering the yield difference if I go from 600 to 800ppfd. Seems like wasted light. I run large numbers of plants in 3 gallon coco. I pull 2lbs from 9 Blue Dream in 3 gallon Coco under Blurple. in a 3 x 3 tent.

I'm in, please show what 2 lbs in a 3x3 looks like. Rounded off, that's like 100g a square foot. I should be learning from you. Thanks.

 

[thetr33man]

Someone should make a little app that calculates umols based upon what cobs you are using, space they are covering and nrg put through them. That would be kinda neat!

 

[dandyrandy]

At my wasted 700w cob grow in an 11 sq foot area. I am three feet tall in 5 weeks veg. I water a gal plus every day. I will see finished buds at least a week sooner. I know. A waste.

 

[medicinehuman]

My main question was that if yield is not effected say on a 600PPFD or 800PPFD than what is the point of the extra light?
Im not a cheap person, but conservative. Real world results mean more to me than hypothetical numbers.
Mainly planning a Vero29 build or CXB build and wondering the yield difference if I go from 600 to 800ppfd. Seems like wasted light. I run large numbers of plants in 3 gallon coco. I pull 2lbs from 9 Blue Dream in 3 gallon Coco under Blurple. in a 3 x 3 tent.

You are doing so good now why change anything. 2 lbs. off 9sq feet is almost unbelievable .

 

[kmog33]

Descent. I pull 3.5oz a sq/f with Blue Dream using Blurple. Plan on upgrading.
With a better yielder you could surely double your yield.

I run a heavy yielding Blue Dream in a 3 x 3 in 3 gal coco. Veg 4 weeks in a scrog to just over 24".
Hit just over 2lbs with 9 plants. Personally I find that light matters, but plant numbers and veg time matter alot more.
I personally will either be running Vero 29 or ACDE DE soon in a much larger space.

got any pics? I would love to see 2 lbs in a 3x3, or a grow with 3.5 oz /sq ft. Never heard of anyone pulling like that.

2 pounds in a 3x3 (that's like 900grams per meter^2) with 4 weeks veg ??!?!? I'd like to see some picture of that...

Agreed.

 

[kmog33]

I want to chime in and suggest the g/m2/day measurement over g/m2. It goes well with g/kwh, and with veg styles different, it's more accurate of a comparison. I run auto flowers in a single tent perpetual SoG and pull 800g+/m2 and nearly 2g/w. But that's 10-12 week seed to weed cycles, and 24/0 lights.

For light, I'd rather have a well spread ppf of 700-800, and add space. With limited space, bombard the suckers with light. Electrical costs are minimal compared to increased yields.

2.5'x5' tent with 23 autos currently

View attachment 3667105

If you're perpetual, how do you calculate your grams per meter squared. You stated grams per meter squared per day, but that implies you're pulling 800 grams per day it sounds like from your post?

 

[kmog33]

At my wasted 700w cob grow in an 11 sq foot area. I am three feet tall in 5 weeks veg. I water a gal plus every day. I will see finished buds at least a week sooner. I know. A waste.

So not a 3x3?