Vegging with 3000k 90cri

Rocket Soul

Rocket Soul

Well-Known Member
Has anyone tried this using any brand? What where your observations?
Would you (for a full cycle fixture)make a panel all 3000k 90cri and add supplemental blue for vegg or use 3000/3500/4000k 80cri and use supplemental red for flower? Just being curious what people think
 
Rocket Soul

Rocket Soul

Well-Known Member
CobKits said:
i am with 3500k 90 right now

it works

not stretching excessively or anything
Click to expand...
Cobby :)

How are they in flower? The ones i got from you for my mate havent been put in action yet.
After the rahzs cri shoot out the 3000k 90 cri looks very tenpting...
 
G

Goerilla

Member
Have I misunderstood something?
When I look at the data sheet it seems to me that CRI 90 only have an output of 80% of a CRI 80.
When we focus on the output at 630 nm its 80% down at the Cri 80 compared to the CRI 90.
I read this like they both have about the same output at 630 nm but at lower nm the output would be higher
with the 80nm.
I also wonder if I can use a 3000K 80 cri for the whole grow, I would prefer 3500K but I can not find them in Europe
and I can get 5 3000K at a good price from Estland.

Rilla.
 
Rahz

Rahz

Well-Known Member
Rocket Soul said:
Has anyone tried this using any brand? What where your observations?
Would you (for a full cycle fixture)make a panel all 3000k 90cri and add supplemental blue for vegg or use 3000/3500/4000k 80cri and use supplemental red for flower? Just being curious what people think
Click to expand...
3000/90 works fantastic for veg on it's own.
 
Randomblame

Randomblame

Well-Known Member
CobKits said:
i have the citizen straight blue cobs in 1212 (not on site) - they have a clear silicone instead of phosphor layer. should work well to temporarily blue-up any spectrum youre using
Click to expand...
Hey CobKits,
Is there a chance that we can buy the blue ones someday? I'm interessted to use intense blue only for an additional last week. I have seen a youtube video from a commercial US grower who use the blues as "terpene enhancer" and when it's true what he said there is no reason for uvb bulbs in the future.
But I've losed the link and do not find it atm, shit. If I still find it, I will post the link later or pm it. But I am sure that the video is linked elswhere here in the forum but don't remember where. Maybe, as heavy user, you have already seen it..?

F..., and again only the second!
 
Randomblame

Randomblame

Well-Known Member
Thanks, good OLD MOTHER SATIVA. Does this "like" mean you know the video I'm talking about?

Sorry Rocket, for short-time hi-jacking your thread but good quality blue COB's are rare...
 
Rocket Soul

Rocket Soul

Well-Known Member
Goerilla said:
Have I misunderstood something?
When I look at the data sheet it seems to me that CRI 90 only have an output of 80% of a CRI 80.
When we focus on the output at 630 nm its 80% down at the Cri 80 compared to the CRI 90.
I read this like they both have about the same output at 630 nm but at lower nm the output would be higher
with the 80nm.
I also wonder if I can use a 3000K 80 cri for the whole grow, I would prefer 3500K but I can not find them in Europe
and I can get 5 3000K at a good price from Estland.

Rilla.
Click to expand...
I think youre right if youre trying to calculate numbers but it seems like plants morphological response counts for quite a lot aswell. Check out Rahzs Cri shootout sidebyside thread, where 90cri won handsdown, both on yield and on finishing time.
 
Rahz

Rahz

Well-Known Member
I can't comment on how it performs compared to HPS, but it will stretch more than a lower CRI choice. There was about 12" more stretch during veg than 3000/80, but it also quit gaining height sooner and by harvest was only about 6" taller than 3000/80.

Dawg's grow seems to be showing the same thing when using 3500/90 compared to 3500/80... so I don't think there's a guarantee adding more blue will prevent that extra stretch. Unless you just have very limited space I would go straight 3000/90, otherwise I would suggest a lower CRI.

Mixing cobs could be over complicating things since you would just be splitting the difference. 50/50 4000K and 3000K would be similar to 3500K for instance.

Rocket Soul said:
Great. Whats the stretch like compared to HPS. In vegg and in early flower?

@Randomblame no worries, the more tlak the better

So if i cant help myself from trying to complicate things like spectrum: better make a 3000/90 and add blue, like a few all blue 1212?
Click to expand...
 
Randomblame

Randomblame

Well-Known Member
Nothing complicated, in the video I've seen they use the blue's without any other light for an additional week or so and this boosts his thc values strain dependent by 20-30%. He shows a lab test with 31% at the end of the video.
 
Rocket Soul

Rocket Soul

Well-Known Member
Rahz said:
I can't comment on how it performs compared to HPS, but it will stretch more than a lower CRI choice. There was about 12" more stretch during veg than 3000/80, but it also quit gaining height sooner and by harvest was only about 6" taller than 3000/80.

Dawg's grow seems to be showing the same thing when using 3500/90 compared to 3500/80... so I don't think there's a guarantee adding more blue will prevent that extra stretch. Unless you just have very limited space I would go straight 3000/90, otherwise I would suggest a lower CRI.

Mixing cobs could be over complicating things since you would just be splitting the difference. 50/50 4000K and 3000K would be similar to 3500K for instance.
Click to expand...
Those 12 inch stretch was on a 5-6 weeks of vegg, right, if we are talking about the side by side you ran? So around 2 inches of extra stretch per week of vegg but about 6 inches less than 80 cri in preflower stretch? (Sorry to hassle you for answers, just nice to have it cleared oit, especially if someone reads this thread without having read your test thread ;)
 
Rocket Soul

Rocket Soul

Well-Known Member
Calculating, by lumens or ppfd, in order to figure out what spectrum is the best for your plants is allright. It can give you an idea of what chips to try out, emphasis try out, with your plants but in the end which one is the best? The one that has the best numbers in the datasheet or the one that grows the biggest baddest plants?
Checkout Rahzs thread: https://www.rollitup.org/t/cri-test-and-mcree-weighted-results.919923/
Side by sides says 90 cri win in yield and finishing time.
3000k 80 is also a good choice, maybe even better for full cycle depending on your situation.
But in the end reallife tests will allways beat datasheets in what will grow the best.
 
Rahz

Rahz

Well-Known Member
Rocket Soul said:
Those 12 inch stretch was on a 5-6 weeks of vegg, right, if we are talking about the side by side you ran? So around 2 inches of extra stretch per week of vegg but about 6 inches less than 80 cri in preflower stretch? (Sorry to hassle you for answers, just nice to have it cleared oit, especially if someone reads this thread without having read your test thread ;)
Click to expand...
Yes, about 5 weeks veg I think. And yes, both 2700/90 and 3000/90 had about 6 inches less stretch in flower compared to the 80 and 70 CRI samples.
 
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