Newb 1200 watt first diy led
- Thread starter Vonkins
- Start date
Trippyness
Well-Known Member
May i ask why 3000k 90 CRI over 3500k 80CRI?
MeGaKiLlErMaN
Well-Known Member
Much more red compared to blue
sixstring2112
Well-Known Member
How many and what cobs on the 5 bars? You want to be around 25 to 45w per sq ft depending on how full the space is.
Trippyness
Well-Known Member
I'm well aware of the red/blue ratio, but why?
3000k is much less efficient than its 3500k brother or even 3000k 80 cri.
Vonkins
Well-Known Member
I've seen results between 3000k and 3500k. 3000k looked better. To each his or her own
Vonkins
Well-Known Member
Sorry I figured u read up to that point. 20 cxb 3590 3000k 90cri
Trippyness
Well-Known Member
Not sure where you saw that , but id would disagree especially with a 90cri.
I would suggest 3000k 80 cri + 4000k 80cri evenly or 3500k. I suggest you maybe take a glace again over CCT.
Vonkins
Well-Known Member
Dro-man80 has 2 flower sides. 1 side has 3500k and the other 3000k. He says the 3500 side looks great but the 3000 side is doing better. PM him, he will explain it all.
Evil-Mobo
Well-Known Member
Yes but there is no proof yet on the high CRI I just built a 600w but went with the 80cri myself using 8 3590's. I'm curious to see how your build turns out.
Evil-Mobo
Well-Known Member
Where do you have proof of this? I would be very curios to see this information to help me build a betrer light next time.
Thanks
Trippyness
Well-Known Member
https://www.rollitup.org/t/why-do-some-want-high-cri.886196/
90 CRI is a bit less efficient than its 80 CRI counterparts.
There are pros and cons to each and 90 CRI have not been tested much other than the 4000k 93 CRI LEC modules.
Your grow your lighting choice. Do some research and make your choice.
Trippyness
Well-Known Member
I will gladly do this but from what I have seen 3500 and 4000k do better than 3000k itself.
Evil-Mobo
Well-Known Member
I have done my research and continue to do so. I am asking for proof of your claims that 3000K is less efficient than 3500K? I quoted you before remember? Now you're all over about 90cri?
That's not what I was asking about as I already know the 90 is less efficient and have gone through the thread you mentioned.
So do you have proof of how the 3K is "less efficient" and by what percentage? Efiiciency on paper or plants? How much less weed does the 3K grow than the 3500K?
Thanks
Last edited:
Moflow
Well-Known Member
How many plants are you gonna be doing in your 8x4?
What medium are you using?
You might have to up your ec ppm on feeding as I have noticed my plant yellowing under the intensity of the cobs it's under.
Like many, I'm still learning on the cob front but hey, that's what it's all about, isn't it?
There is some great info on this site.
Hope your grow goes well
What medium are you using?
You might have to up your ec ppm on feeding as I have noticed my plant yellowing under the intensity of the cobs it's under.
Like many, I'm still learning on the cob front but hey, that's what it's all about, isn't it?
There is some great info on this site.
Hope your grow goes well
Vonkins
Well-Known Member
I was thinking 10 or 12. I have no problem shortening up my room. Just wondering if I need to.
dro-man80
Well-Known Member
Hey guys I will be updating the final results of previous journal today hopefully between my 3000k vs 3500k run,,,I recently built 2 new lights so the next run will be with all the same cuts,3000k 80CRI--Vs--3000k90CRI--Vs3500k80CRI,,So I'm pretty excited to see what difference the 80vs90 show,,,but with some of the same cuts under each spectrum placed thruout different areas in my grow-room ,the 3500K did beautifil,,,Just did'nt stand up against the 3000k80CRI side
but all in all the entire run was awesome for a first timer LED run..I'll stop by when I update if any of u good fellows are intersted,,much love and peace to all
but all in all the entire run was awesome for a first timer LED run..I'll stop by when I update if any of u good fellows are intersted,,much love and peace to all
Mullumbimby
Well-Known Member
When I first read that modern, white LEDs were delivering better results than blurples, I tried to find the answer to this question, without much success, and concluded that no none had really got to the bottom of it but that clearly the plants liked a range of different light wavelengths. Since no one knows why, I figured that I'd pick a range of different temperature 3590 COBs.
In my 4x4, I've got 8x 5000K, 4x 3000k 90cri and 4x 3000k 80cri.
I liked the look of the 80 and 90 curves in the Cree datasheet, and assumed that since no-one knows what's what, a wider coverage of red spectrum may help.
I'm planning to use the same fixture for a fairly long veg and then flower time, and upgrade later to two fixtures, with lower temps on the flower only one, and higher temps for veg only.
I'll post how this works out for me when the run is over..
FWIW, the 'efficiency' of the various Cree Cobs is alluded to in the Cree Datasheet Here:
http://www.cree.com/~/media/Files/Cree/LED-Components-and-Modules/XLamp/Data-and-Binning/ds-CXB3590.pdf
and more detail is available within RIU here:
http://rollitup.org/t/cob-efficiency-spreadsheets.865238/
Also, its interesting to note that @Growmau5 , whose opinion I value very highly, appears to have concluded that 3500K works fine for him, in both Flower & Veg.
sixstring2112
Well-Known Member
im running the 2700k in 80cri and i think this run is going to be awesome.the plants under those cobs sure got frosty fast .