DHP Presents Citizen Cob 1812 3500k 80CRI Vs 1812 3500k 90 CRI

Ok My Fellow Cobblins My 80 Cri Is Still Chugging Along. One Thing About These Clones Is They look Nasty when Their Finishing. I Mean I've Never Had A Plant That The Leaves Would Wither Up And Die All the While The Plant Is Still Feeding I Don't Know Crazy Man Just Plain Azz Crazy

90 Cri


80 Cri

Strange behavior, but as long as you get no bud rod caused by the dead leaves, it saves you a lot of manicure.

BTW,
these CRI80 buds looks also heavy 'n chunky!
Curious to see final weights!

hate that shit, nothing worse than picking out a bunch of leaves then the crispy ones break off and stick to everything. wifey slaps me when i do that :0



lookin chunky tho!

Would love to know the final weights.

I wonder if someone else did a side by side comparison like Dawg is doing here. Not saying this experience isn't reliable but would be good to have more sources of comparison before a definitive conclusion.

Now I feel frustrated to have chosen 4000k 80CRI...

Anyway, nowadays COBs are the cheapest component in a light fixture when considering the cost of the heatsink and driver. For instance my 250W light fixture had a cost of 200$ including all parts, the 5x COBs only make 50$ of the equation.
So for another 50$ I can get the "ideal" 3500k 90CRI and keep all the rest equal.

It's nice to have this flexibility an being able to adjust things as people's experiences, knowledge and understanding of things progress.

Did 3000k 80, 90 and 80/90 mix this cycle using vero 29 se c cobs run really low using PWM for dimming at around 2/3rd duty cycle.

The higher CRI visibly looks better as a light with the 80 having more of a yellowish hue. PPFD measurements are the same for both.

Subjective anecdotal observations lean towards the higher CRI but it isn't significant to the point of scrapping a set up and starting new.

I will be getting 90 CRI or higher from now on though. It is just easier to work with and the plants like.

@dawg regarding those crunchy sugar leaves you might be able to reduce them with lower color temp and heat temps. 3500k might still have too much blue which I have found to cause that yellowing in sugar leaves. When I reduced the blue and upped the red it went away and now I just get gradual yellowing on the major fans leaves. Come harvest time the sugar leaves are nice green with good frost and usually snap off clean from the stalk instead of crumbling.

Photon Flinger said:

Subjective anecdotal observations lean towards the higher CRI but it isn't significant to the point of scrapping a set up and starting new.

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Not so sure if it isn't significant. Having in mind the pictures I wouldn't be surprise if the 90 CRI yielded 30% more or so. That would be enough to justify the upgrade, the new COBs would be paid off in a single grow.

Before any conclusion/change I will wait for the final weights.

Metacanna said:

Not so sure if it isn't significant. Having in mind the pictures I wouldn't be surprise if the 90 CRI yielded 30% more or so. That would be enough to justify the upgrade, the new COBs would be paid off in a single grow.

Before any conclusion/change I will wait for the final weights.

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You can still mix them, just add in new higher CRI to the existing lower ones when you can. 2:1 80/90 CRI mixture came out just fine.

Next up is adding in some of the Decors at 97 CRI but the the Vero se versions are only 18s.

Metacanna said:

Not so sure if it isn't significant. Having in mind the pictures I wouldn't be surprise if the 90 CRI yielded 30% more or so. That would be enough to justify the upgrade, the new COBs would be paid off in a single grow.

Before any conclusion/change I will wait for the final weights.

Click to expand...

I have no validity to confirm this and I am talking specifically about Citizen 1818s, but I will be using 4k 80cri for veg, in hopes of getting less stretch and aiming for maximum efficiency. However, I will be swapping to 3k 90cri when I flip them. I don't think they're "bad" so much as different i.t.o pros and cons. I think there's more to this topic than just assumptions and anecdotal evidence.

Maybe Mr @CobKits could weigh in, with an expert's opinion, but I based my decision on the spectral output of each cob.

As you can see here, the 4k 80cri cob has a relatively even response in terms of reds and blues. I am hoping that this shift will simulate summer morning light. The 20% cutoff on this is 690nm, with 660nm ("photo red") having an intensity of only 45%. Blues peak at 91% over 450nm. If you look at the area under the curve, the 4k 80cri has the "most" output of the bunch, which equates to it having the best efficiency (ignoring ppfd etc)





Compared to the 3k 90cri, which I am hoping will give me more stretch and vigorous growth. This cob has significantly less blue light and has 20% intensity at almost 725nm - giving us a little far red and a whole lot more 660nm (80%) whereas blues also peak at 450nm, but with only 60%. This curve has considerably less area under the curve than the 4k90cri and I assume then also the 4k80cri, meaning it's less efficient




In summation, again specifically considering the 1818s,

4k80cri: (130lm/W at 1200mA according to what I've got written down)
20% max: 690nm
660nm: 45%:
450nm: 91%

660:450 2:1

3k90cri: (162lm/W at 1200mA)
20% max: 725nm
660nm: 80%
450nm: 60%.

660:450 1.33:1


Again, I think they are different tools and a balance needs to be struck to get the best out of plants. Not to mention, so many strains respond so differently that one man's recipe to success may not be the recipe to your own success.

DonnyDee said:

Maybe Mr @CobKits could weigh in, with an expert's opinion, but I based my decision on the spectral output of each cob.

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i think were still learning, but youre on the right track. a lot of people like the same light from start to finish to minimize stress on the ladies so theres something to be said for that. that said keeping cobs all the way thru and switiching spectra prob isnt as stressful as say T5/MH>HPS

That is another good topic for discussion, the stress on plants when switching light source. And if it is better to use one spectrum for a full grow.

Going from blurple/pink/heavy red and blue mix to white is a huge hit on the plants from what I can tell. Takes them a good week to adjust. The leaves go from thick dark green to thin lighter green but much faster growth. This is probably due to the plant knowing what the best configuration is for its leaves and needs to switch. Kind of like swapping goggles for a bike in a triathlon.

Switching from cool white to warm white didn't appear to require a period of adjustment but the growth rate immediately improved as expected when flipping to 12/12. I also use supplemental UVA for pest control in my grow area so that may offset any drop in lower wavelengths for the warmer CCT.

Just to add to the confusion, some SPDs will be better for different genetics.

Ok My Cobblites I'm Tired Hungry So I Will Respond Later To Yalls Response's Now Why Does It When I Pee!!!!!!!!!!!! Peace And Stay Away From The Toilet Seat


Up Next is The Harvest Weights From The 90 Cri. I Had A Total Of 179.1 Grams or 6.41 Ounces

So did the 90cri just finish faster or where they also bigger

Next Is Some Samples Of My Chunky Monkey. if The Flash Hadnt Washed Out The Weights You Would See That The Heaviest Is 6.9 and The Lightest Was 6.5. Damn Would Yall feast Yalls Eyes On Some Bud Candy!!!! Hummmm Hummm Good Aunt Bee

Justwannagrow6906 said:

So did the 90cri just finish faster or where they also bigger

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80 Cri Is Still Running So the 90 Cri Finished 1st

Finished weeks ahead of schedule? So the 80's could very well be just as big just not done so fast. This is very interesting, I actually learned about this grow on 420, had to come see for myself, beautiful setup, exactly what I want a 4 cob set up, vero 29 though sorry, hey by the way what are the dimensions of that light, curious at how far apart the cobs are from each other center to center.. inches not metric, Pittsburgh pa USA.

@The Dawg
Are you running 12/12 or a different light schedule?

The 90 CRI plant was harvested on day 56 of flower?

so playing devils advocate what are the chances that the 80 cri just needs more calcium or some nurtrient adjustment that would precude getting the outter leaf "crispies"...i do not see that scenerio in every grow here using 80cri..and an earlier finish is not always the best for yield..
love yer music videos dude

Randomblame said:

Strange behavior, but as long as you get no bud rod caused by the dead leaves, it saves you a lot of manicure.

BTW,
these CRI80 buds looks also heavy 'n chunky!
Curious to see final weights!

Click to expand...

No Bud Rot Just Crispy Fan Leaves

Metacanna said:

Now I feel frustrated to have chosen 4000k 80CRI...
.

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Don't Because I'm Still Using My 1st Cob Setup Which Is My Beloved Vero29 4000k 80 Cri And I'm Still Loving Them. Now With That Said I Do Have A Gen7 Vero29 4000k 90 Cri In The Wings Waiting.

Photon Flinger said:

@dawg regarding those crunchy sugar leaves you might be able to reduce them with lower color temp and heat temps. 3500k might still have too much blue which I have found to cause that yellowing in sugar leaves. When I reduced the blue and upped the red it went away and now I just get gradual yellowing on the major fans leaves. Come harvest time the sugar leaves are nice green with good frost and usually snap off clean from the stalk instead of crumbling.

Click to expand...

Ok My Hommies I Will Come Clean. I Ran 6 Clones And They All Did This. The Reason Why Is Simple I Abused The Mother Plant And They Were Deficient From The Beginning.

DonnyDee said:

Again, I think they are different tools and a balance needs to be struck to get the best out of plants. Not to mention, so many strains respond so differently that one man's recipe to success may not be the recipe to your own success.

Click to expand...

I Like The Way You Think Brother. Back In 2011 I Started A Post Looking For The Perfect Spectrum On The Now Defunked Bubbleponics Fourm. Well 6 Years Later Were Still Searching

Justwannagrow6906 said:

Finished weeks ahead of schedule? So the 80's could very well be just as big just not done so fast. This is very interesting, I actually learned about this grow on 420, had to come see for myself, beautiful setup, exactly what I want a 4 cob set up, vero 29 though sorry, hey by the way what are the dimensions of that light, curious at how far apart the cobs are from each other center to center.. inches not metric, Pittsburgh pa USA.

Click to expand...

Hell I Just Like ZZ Top Im Nation Wide Lmao

I Believe I Counted 37 Top Colas For The 90 Cri And 35 Top Colas For The 80 Cri. So The Finial Will Be Interesting

These Lights Are On 12 Inch Centers

OLD MOTHER SATIVA said:

so playing devils advocate what are the chances that the 80 cri just needs more calcium or some nurtrient adjustment that would precude getting the outter leaf "crispies"...i do not see that scenerio in every grow here using 80cri..and an earlier finish is not always the best for yield..
love yer music videos dude

Click to expand...

No Need To Play Devils Advocate I Came Clean.